I got this from a Child magazine, it's very yummy.

Southwestern Beef Bake

2 Tbsp vegetable oil
1 1/2 lb ground beef,(or ground turkey, or cubed chicken breast)
1 (15 oz) can black beans drained
1 (9 oz) can corn drained
1 medium onion chopped
8 oz sour cream
1 cup mild salsa
3 cups crushed tortilla chips
8 oz shredded cheese
1 medium tomato chopped

Preheat 425. In large skillet heat oil saute beef for 5 min. until fully brown. Drain. Place beef in lg mixing bowl combine with next 5 ingredients. Stir until completly blended. Spoon enough of beef mixture in a 2qt casserole to cover bottom. Arrange half of chip pieces on top of meat mix. Sprinkle with half of cheese. Repeat this layering pattern. End with cheese and chopped tomato. Bake for 10-15 min. until cheese is melted.