Aaron Tippin's Mexican Casserole

From chef2chef.com; no i don't know if this is really aaron tippin's recipe, but it tastes wonderful.

Preheat oven to 350.

Brown the meat and onion in a skillet.

Add the taco seasoning and water , and let simmer for 5 minutes.

In a baking dish , put one layer of tortillas , then 1 / 3 meat mixture on top , followed by layer of beans and layer of cheese.

Repeat two more times , ending with cheese.

Bake for 30 minutes , or until cheese is melted and beginning to brown.

corn tortilla, chili beans, cheddar cheese, ground beef, taco seasoning, water, yellow onion