Cowboy Casserole

1 onion, chopped
1 1/2 pound ground chuck, browned and drained
6 medium potatoes, sliced
1 can red beans
1 (8 ounce) can tomatoes mixed with 2 tablespoons
    flour or use 1 can tomato soup
Salt and pepper and garlic to taste

Put chopped onion in the bottom of the crockpot; layer with browned ground beef, sliced potatoes and beans. Spread tomatoes or soup over all. Sprinkle with seasonings as desired. Cover and cook on LOW for 7 to 9 hours.