Brown and drain the ground beef in a frying pan, then place it in the crockpot.
3 pounds lean ground beef
Add the onion, mushrooms, olives (if using), Italian seasoning, sugar, salt, and pepper. Stir to combine.
1 yellow onion, 16 ounces baby bella mushrooms, 6 ounces medium black olives, 2 tablespoons Italian seasoning, 2 tablespoons granulated sugar, Kosher salt and freshly ground black pepper
Pour in the diced tomatoes and pasta sauces. Stir well.
28 ounces petite diced tomatoes, 24 ounces four cheese pasta sauce, 64 ounces marinara sauce
Set the crockpot on low for 6 hours or high for 3 hours.
Serve with cooked spaghetti noodles, fresh parmesan, and dried basil.
2 pounds cooked spaghetti noodles, 8 ounces freshly shredded Parmesan cheese, Dried basil