Preheat oven to 400 F. Place entire bag of meatballs in a medium saucepan with sauce (feel free to add garlic, onion powder, salt, and pepper to taste) and cook over medium heat until warmed through, about 10 minutes. Stir as needed to keep meatballs from sticking to the pot. Remove from heat.
Place meatballs in the center of a 9x13 baking dish, layer mozzarella and Italian blend cheeses over meatballs topping off with the Parmesan
Lightly spread garlic butter on the bread or brush lightly with olive oil and garlic and place on a sheet pan (even if you leave the bread plain, it will still turn out fabulously—delicious!).
Place the pan of meatballs and the sheet pan in the oven and bake for approximately 25 minutes or until cheese is melted and bubbly and bread is lightly toasted (keep an eye on the bread as every oven is unique)
Remove from oven, line the meatball pan with the bread so the pieces are standing up around the perimeter of the pan. Enjoy! Serves 6 to 8. Recipe multiplies easily.