Answer:
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
A serpent swam in a silver urn, A golden bird did in its mouth abide, The serpent drank the water, this in turn, Killed the serpent. Then the gold bird died.
I grow for a surface, even if you cut me. I continue to grow even after death.
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.