Mexican Casserole

1 lb. ground turkey or lean ground beef
1 large onion, chopped
1 packet Taco Seasoning mix (1/4 cup)
1 can black beans, drained and rinsed
1 can diced tomatoes, drained
1 can cream of mushroom soup
8-10 corn tortillas (12 oz package)
3-4 cups shredded Cheddar cheese
Haas avocado, sliced
sour cream
fresh cilantro

Brown meat with diced onion over medium heat. Add the taco seasoning, black beans, tomatoes, and cream of mushroom soup. Stir to combine and warm through. In 9x13 inch pan, place a small amount of meat mixture on bottom (so tortillas won't stick). Place a layer of corn tortillas down, then a layer of the meat mixture, and sprinkle on a little cheese. Repeat with another layer of corn tortillas, a layer of meat mixture... and top with remaining shredded cheese. Bake in a preheated oven at 350 degrees for 30 minutes. Serve topped with sliced avocado, sour cream, and fresh cilantro.