I Love Bees (a Halo 2 ARG): Kamal is a male example. He microwaves a whole raw chicken, cuts it up in exactly equal slices, and in place of Worcestershire sauce and butter uses ketchup and butter-flavored popcorn oil.
SCP Foundation: SCP-666½-J is a crab-stuffed mushroom dish that was given SCP status the day after it was presented. According to the file, it tastes relatively fine, other than an odd salty flavor, but soon enough sets off what can only be called a localized apocalypse on the eater's digestive system.
In Twitch Plays Pokémon Emerald, the Mob tried their hand at making Pokeblocks. The result were level 10-11 Pokeblocks with 19-23 feel. Higher numbers are worse, and it used to be thought that you couldn't make anything higher than a level 9 Pokeblock. To quote Twitch Plays Pokemon's own Epic Fail page: "So what we have is a previously incomprehensibly bad tasting Pokeblock that goes down worse than sandpaper embedded with razors." Then, in the Platinum run, they tried to make Poffins, which it turned out they couldn't do. Literally - they were unable to stir the mixture due to the input format and ended up burning their creations horribly.
Gunhilde, otherwise known as "Greasestain" is one of these and, apparently, she isn't safe eating her own cooking, seeing as she uses "unconventional" ingredients and the fact she's suffering from some of the side-effects (she's balding as per her profile pic). Somehow, she got a job as a lunch lady.
The few times Ashens' Chef Excellence actually attempts to do his job, he's this in spades. The film's version of the character is not actually a chef (though he sure as hell will talk you down like he's one), just the former mascot of a frozen food company made entirely of Lethal Chefs.
Bunny: Accident my ass! When I was her age, at the time, I knew what to put in some damn Kool-Aid and what she used was NOT what you put in Kool-Aid.
In Welcome to Night Vale episode 56 Earl Harlan, sous chef at Night Vale's newest restaurant, shares a tiramisu recipe on the community radio show that he warns is highly poisonous and will probably kill you. Another time he shares his recipe for pulled pork, which includes killing the pig, and spends a lot of time on the subject of killing the pig, before quickly rattling off a seemingly normal recipe for pulled pork.
Most videos on the Hydraulic Press Channel and its sister channel, Beyond the Press that involve food being 'prepared' using the titular hydraulic press play this trope for laughs by not even attempting to make edible products. Between the two channels, they've squashed food flat with the press or with the host dropping his powerlifting weights on them, dropped canned food into a campfire until it explodes, shot it out of their homemade air cannon, attempted to roast it using a solar-powered 'death ray', attempted to use liquid nitrogen to brew coffee instead of water and if it's food that typically requires heat during the cooking process, they blast it with a flamethrower.
"In Hydraulic Press Kitchen, there is no time for oven." (starts up flamethrower)
Swedish YouTube channel Monte Fjanton has the series Basses Rätt i Skafferiet, where Basse cooks disgusting food and makes his friends eat it.