A subtrope of Amusing Injuries
in which a burst of flame, explosion, or just crashing into a wall or tree instantly burns the feathers or fur off of something and magically turns it into a perfectly-cooked chicken or turkey, complete with bone drumsticks, or any other choice cut of meat. It's funnier if the victim isn't particularly avian in any way and it still looks chicken-like. Cousin Trope to Meat-O-Vision
and, for heat applied to vegetables, see Popcorn on the Cob
Most definitely this is not how things work in real life -- proper cooking requires carefully-controlled times and temperatures.