Step 1

Combine beef, onion and garlic in a large skillet and cook until meat is browned; drain.

Step 2

In a 4-quart crock pot, combine tomatoes, tomato paste, mushrooms, bay leaf, Italian seasoning, salt, and black pepper.

Step 3

Stir in meat mixture.

Step 4

Cover and cook on LOW for 8 to 10 hours, or on HIGH for 4 to 5 hours.

Step 5

Stir in sweet chopped sweet pepper.

Step 6

Discard bay leaf.

Step 7

Spoon sauce over cooked spaghetti.

Step 8

Sprinkle with Parmesan Cheese.

Step 9

Serve.