Answer:
In the forest, this blends in just right, but every December it is covered with lights. What is it?
I can move even when you are still. I can be one or many.
Goes over all the hills and hollows. Bites hard, but never swallows.
A house full, a yard full, a chimney full, no one can get a spoonful.
I am the red tongue of the earth, that buries cities.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.