Crock Pot Pasta Sauce

1 lb ground beef
1 onion, chopped
1, 28 oz can crushed tomatoes
16 oz can tomato sauce
1 lb Italian sausage, chunked
2 cloves garlic, crushed
1 Tbsp Italian seasoning
2 tsp dried basil
red pepper flakes to taste

Brown beef and onions in skillet and drain. Put in crock pot and add remaining ingredients. Cover crock pot and cook on low for 8 hours or high for 4 hours. Serve with pasta of choice.