1 lg. onion
4 tbsp. butter
1 lb. ground beef
1/2 c. rice, cooked
1 lg. can whole tomatoes
1 tsp. chili powder
Salt
Pepper
1/2 c. grated cheese

Combine all ingredients, except cheese. Pour in greased casserole dish, and top with cheese. Bake at 350 degrees for 1 hour.