Cross Epoch, the official Dragon Ball/One Piece crossover one-shot manga, ends with everyone meeting the dragon Shen Long in the "world of confection", an island with mountains made of cake and rivers of tea (among other things), for the best tea party ever.
The Junko Mizuno version of "Hansel and Gretel" has the witch create Foodland during a food shortage to lure everybody away. Of course, it turns out to be a giant illusion and all the people happily eating away in Foodland are really eating dirt.
Mentioned in the Literature section, but expanded upon in the Tim Burton remake film. Willy Wonka in Charlie and the Chocolate Factory clarifies that everything in the candy room is edible, including himself.
Wreck-It Ralph has Sugar Rush, a cart-racing game based entirely around this - rolling gumball boulders, candy-cane forests, bubble gum swamps, Laffy Taffy vines, etc.
Charlie and the Chocolate Factory has Wonka building a palace out of chocolate at the request of an Indian prince. There's also the Chocolate Room in Wonka's factory, which features a river of chocolate and has plants and grass that are actually candy.
A short story from the Doctor Who short story collection Short Trips and Side Steps featured the Doctor and Romana celebrating K9's birthday on a world apparently made entirely from candy. How this came to be is never fully explained.
Mono Island in The Last Continent, where foods such as chocolate, cheese and cake grow on trees. It turns out that this is because the island is the testing ground of the God of Evolution.
The Discworld also has large lard deposits under ▄berwald. And raw treacle deposits (caused by prehistoric sugar cane forests trapped in the geological strata) under Ankh-Morpork. However, most of Ankh-Morpork's treacle comes from toffee beds (in the Ramtops somewhere, IIRC).
In The Light Fantastic, Rincewind and Twoflower take shelter for the night in an abandoned gingerbread cottage. Apparently, it was once a popular architectural style for witches, but fell out of fashion due to the impracticality of, for example, cotton candy doormats.
In Lucian of Samosata's True History, the sailors visit, among other outlandish places, an island with rivers of wine, and an island made entirely out of cheese.
The children's book Cloudy with a Chance of Meatballs (and the movie it inspired) are about this. The actual landscape isn't made of food, but (as you might guess from the name) the weather most certainly is. "Restaurants" lack roofs, and are mostly just nice places to sit while waiting to be fed by the sky.
In the very first (and seldom seen) Moomin book The Moomins and the Great Flood, the Moomins visit an old man whose garden is made of candy and sweets. The old man invites them to stay, but Moominmamma declines, saying that the children have already gotten a stomach ache from all that sugar, and she needs to find them some real food.
Live Action TV
Nick Arcade has the Food Frenzy level from the video zone where a food fight occurs and the player has to dodge the edible projectiles and the gym teacher while picking up three textbooks.
Many, many of the obstacles on Nickelodeon's Double Dare. Some of the physical challenges qualify as well.
The obscure Gershwin song "In Sardinia (On The Delicatessen)".
The video to 'California gurls' by Katy Perry and Snoop Dogg - takes place in a board game called 'Candyfornia' (Making it two Wackylands in one)with candycane trees, candycane snakes, giant donuts, candyfloss clouds and the like.
Also the setting for her California Dreams Tour, where Katy searches for a place called 'Candyfornia' through a strange land made out of candy.
In The Nutcracker, there's the Land of Sweets, populated by various dancing delicacies and the Sugar Plum Fairy.
The folk song "Big Rock Candy Mountain" features a lemonade spring, alcohol streams, and lakes of stew and whiskey. Level Ate is especially evident in the Bowdleried version, which omits such details as the ease of escaping jail and the bushes growing cigarettes.
In one old Garfield comic, Garfield falls asleep and dreams he's in "the Land of Large Breakfasts" where he eats a giant pancake. He wakes up, and says it was a great dream... Then he turns around and exclaims, "Where's my blanket?!"
Older Than Print: Cockaigne, in a piece of medieval folklore, is an imaginary land of ease and pleasure, including such things as raining cheese; pigs that wandered, already roasted, with knives to make carving easy; cooked fish that jumped out of the water; streets paved with pastry; houses of barley sugar. The streets would be hell on cart wheels and horse feet. And visa versa.
The Big Rock Candy Mountain — a hobo song about a land similar to Cockaigne. In what are generally accepted as the oldest versions, Big Rock Candy Mountain also features streams of alcohol and cigarette trees.
Also, Garrison Kieller's "Out In The Catskill Mountains": a parody version about cats' beloved "land of milk and salmon", where the birds are found right on the ground and the mice run very slowly.
The Trope Namer is "Level Ate", the eighth level of Earthworm Jim 2, which is made primarily of meat, with cheese, french fries, eggs, and eating utensils also to be found. There's also a secret level called "Totally Forked", which, as its name implies, is much heavier on the forks. Oh, and did we mention the boss of the level is a fire-breathing steak named Flamin' Yawn?
The Birdday Party world in Angry Birds and the Utopia world in Angry Birds Space.
Super Mario World has several levels with Edible Theme Naming, but Chocolate Island appears to be made of chocolate, including boiling hot chocolate pits where other worlds would have lava. By the same token, Choco Island and Choco Mountain from the Mario Kart games qualify.
Sweet Sweet Galaxy and "Bouncing Down Cake Lane" in Toy Time Galaxy from Super Mario Galaxy.
Super Mario Galaxy 2 reuses the trope with Sweet Mystery Galaxy, a level based around a spotlight that revealed hidden platforms. And the contents of the candy bars you're walking on.
As James Pond 2: Codename Robocod takes place at Santa Claus's castle, a sizable fraction of its levels are some form of this trope, usually the "sweets" variant.
Every level in James Pond 3: Operation Starfish is made of food, and most are a dairy product of some kind. The game takes place on a moon that is literally made of cheese.
IIRC, the game takes place on the DARK side of the moon, which is the only side made of dairy products.
Many levels are given awesome names based on the type of terrain.
The game begins in a cheese area and ends in an ice cream plateau, progressing through custard, yoghurt, butter, blue cheese and a squicky green area (which happens to be the largest) referred to in-game only as "slime".
And to top it all off, the game also contains a fruit gun and giant fruit armour.
BurgerTime is mostly about walking over giant burger pieces to make them fall against each other. This helps deal with the pissed-off Anthropomorphic Food chasing you around the screen.
Palette's castle level in Graffiti Kingdom. Elevators are giant pancakes and on the stage there are giant bottles of milk, salt shakers, ice cubes, snowmen, and the main areas are completely made up of shades of pink.
The Candy Chateau in Rayman, which is also (amusingly and unfittingly enough) the final level and the contrasting villain's hideout. However, the level's boss arena is a radical departure from the stage itself (It is a generic castle room with no trace of this trope).
The secret "good" ending of 1213 replaces the disaster that reduced the Earth to a seemingly-lifeless toxic wasteland... with one that turned it into a world made of candy, where the lead character rules as hyper-metabolic god-king for the rest of his life.
The Very Definitely Final Dungeon of Psychonauts is the Meat Circus, A literal combination of Raz's own nightmares from his circus upbringing, and another character's nightmares from his father's butcher shop. As can probably be guessed, the level is very macabre.
A few of the maps in the Worms series are food displays.
The second level of Wayne's World, a Macro Zone where the obstacles and enemies are donut shop food/supplies.
Everything except the walls in Pac-Man can, under the right circumstances, be eaten by either Pacman or the ghosts.
Speaking of Tycoons, RollerCoaster Tycoon has the unlockable Wonderland theming in some levels, including statues made of liquorice. You can create your very own Level Ate with it, if you have enough money. (Fruit trees count too.)
Or just build a lot of food shops.
Kylin's realm in SaGa Frontier is made of sweets and home to orphans.
The GameCube RPG Baten Kaitos (the first one) had a town composed entirely of Gingerbread Houses and other confectionistic construction. At one point, the party does wrong by the inhabitants and is locked up in someone's house. Their third option is obvious.
Hansel and Gretel's stage in We Love Katamari has two missions: one is to destroy a Gingerbread House, and the other is to sweep up over a thousand candy wafers that form a mosaic.
A mosaic of Beethoven. Or sometimes a giraffe, or a dog, or a parrot...
The first stage of Jazz Jackrabbit... thing... "Holiday Hare" was full of sweets in the background, including gingerbread men... some with their heads bitten off.
Bible Buffet simulated a board game in the vein of Candy Land (but with action stages involving food that tries to kill you), only skewing more toward the "main course" side of things.
One level of The Simpsons: Bart and the Beanstalk had Bart jumping around on oyster crackers in a bowl of soup.
The Simpsons Game's tutorial level is based in the candy-filled dream-world featured in the show. Exactly how the collectibles gathered there make it out to the rest of the game world along with the player is anyone's guess.
The "Chocolate" theme in Spore's terraforming kit. One makes a chain of mountains shaped like chocolate pieces, another sinks gigantic trays into the ground.
The top-down arcade-style shooter Tyrian was in love with this trope. The game used fruit and its associations with a mythical religion in the game as a Running Gag, with fruit dropping from some dead spacecraft, religious leaders complaining about fruit floating in space, and escalating to an absurd final level that was entirely made of fruit, where you confront the enormous fruit-ship armada of the Church Militant. And it gets even weirder, for some levels of the fourth episode revolve around various floating bodyparts. As in eyeballs, ears, hearts, and brains, not those body parts. Also, the most powerful ship available to the player in the original 1.0 version of the game was a flying carrot that shot exploding bananas.
Level 3 of Gokujou Parodius, which parodies a level of Gradius 3 by replacing its sand dunes with delicious pastry.
The Sweets theme from Animal Crossing: City Folk/Let's Go To the City allows you to transform your house into a candy paradise, with a bed that looks like a cake, tables that look like flan and shortbread cookies, and more. The associated walls even look like the inside of a Gingerbread House!
Also, in all the games, the "Fruit" series contains several pieces of furniture that look like fruit: Pear-shaped dressers, an apple-shaped TV, a pineapple bed, orange- and lime-shaped chairs, and a table that looks like an enormous half of a watermelon.
Pikmin 2 includes one underground area called the Glutton's Kitchen, which is full of donuts, candies, and the like.
While not entirely made of food, Banjo-Tooie's Cloud Cuckooland featured at least one sky-island made of Jell-O and a giant trash can filled with foodstuffs, not to mention a giant wedge of cheese containing flying spiked oninons and an atmosphere so stinky it's actually toxic.
During the early 2000's the designers of NCAA Football tried to distinguish themselves from their big-brother franchise by making the game "wackier" with mascot games and joke stadiums, including a literal oversized Cereal Bowl.
Sweet Mountain Zone from Sonic Colors. This is especially prevalent in Act 2, parts of which have Sonic going around a giant cheeseburger filled with cake and jellybeans. Cubes of gelatin block Sonic's way but not laser blasts, gigantic missiles explode into jelly beans, and robots swing whisks at any intruders. That's because this is actually one of Eggman's munitions factories disguised as a land of cakes and lollipops.
Eggman's PA announcements deconstruct the nature of this zone, describing various flaws (like melting rides) in that zone, and warning visitors not to lick the attractions (because that would be disgusting).
Kirby's Epic Yarn has Sweets Park in Treat Land (the Hub is made of this trope, even though not all of its levels are). Most Kirby game have this in one way or another.
Panic Restaurant. The whole point is that you fight your way through a restaurant full of mutated food for enemies.
While there are platforms made of stone to be found, the Golden Temple of Donkey Kong Country Returns has many platforms made of strawberries, blueberries, cherries, cinnamon sticks, oranges, and, of course, bananas.
One of the possible floor designs of the Item World in Disgaea 4 is a giant cake.
Obscure Famicom title Bio Miracle Bokutte Upa has no less than three stages like this - a candy/cake word, a vegetable world, and a milk/cheese world. The crossover game Wai Wai World 2 has the same sort of food-themed level design in World 5, along with Upa himself.
The Dizzy spin-off games, Fast Food and Kwik Snax.
The Chinese children's browser online game Aura Star has an ice cream planet filled with cute snowboarding ice cream mons and sentient anthropomorphic ice cream people.
Candy Crush Saga is, as implied by its title, Bejeweled set in a sweet tooth's paradise, where the gems are candy and every set of levels is given a candy-related theme.
The worlds in Wario Land: Super Mario Land 3', namely: Rice Beach, Mt. Teapot, Sherbet Land, Stove Canyon, SS Tea Cup, Parsely Woods and Syrup Castle.
Vaarsuvius of the Order of the Stick was once teleported into the Elemental Plane of Salad Dressing.
Judging by the names of some of its location (as seen on a map provided by Quadling) and what we've seen of Pepper's castle and its surrounding area, Yellow Country from The Black Brick Road Of OZ has a lot of places that fall into this trope.
Fittingly, the Land Of Chocolate made it into The Simpsons Game.
Teen Titans: In one episode, Cyborg is infected with a computer virus, and hallucinates that the world (and his teammates!) are made of food. They aren't, as he discovers to his chagrin when he comes to his senses. (See also Meat-O-Vision.)
Mother Mae-Eye later turned the Tower into gingerbread.
The I Am Weasel episode "Dessert Island", which actually turns out to be a real dessert that a human child orders, and then eats.
In one Popeye cartoon, Popeye, Olive, and Wimpy visit the moon, which is actually made of cheese, and populated by cheese-men. Unfortunately, the Big Cheese who rules the place is a cruel tyrant. (A dose of spinach later, and Popeye manages to turn him into crumbs.)
The Powerpuff Girls pilot has hillbilly Yeti Fuzzy Lumpkin developing a gun that turns everything in the city (including the city) into meat, as revenge for his meat-flavored jam losing a competition.
In the Family Guy episode "Deep Throats", Peter and Lois smoke so much pot that they see a 'magical land of desserts'. They both start to lick a pile of ice cream, which turns out to be an emotionally scarred Chris.
In the very first Wallace & Gromit short, A Grand Day Out, they go to the moon for vacation because it's made of cheese.
Adventure Time has the Candy Kingdom, complete with a bubble gum princess.