Finely dice 2 cups of onions and 4 cloves of garlic.
Put the oil in a large skillet and heat to medium low.
Add the onion and saute util it is translucent. About 10 minutes. Add the garlic and cook 5 more minutes.
Add all of the ingredients to the slow cooker except the 12 ounce package frozen meatless crumbles. (about 56 total ounces diced tomatoes, 2 large cans or 4 smaller ones)
Cook on low for 6 to 8 hours adding the frozen meatless crumbles the last two hours.
If you want to cook on high then cook 3 to 4 hours adding the frozen meatless crumbles the last hour.
Serve hot with spaghetti.