This recipe for crockpot spaghetti sauce is perfect for a busy weeknight. Simply brown some ground beef and add it to your slow cooker with canned tomatoes, tomato paste, chopped vegetables like onions and bell peppers, and seasonings like oregano and basil. Let it cook on low for 6-8 hours and you'll have a flavorful and easy spaghetti sauce that's perfect with some pasta and garlic bread.