Double the comfort by combining spaghetti and meatballs and grilled cheese! If you do not have time to prepare spaghetti and meatballs especially for this recipe, wait until you have leftovers!
Warm a skillet over medium heat for 3 to 5 minutes. Place the bread slices on a flat work surface. Spread 1 tablespoon of butter evenly over one side of each slice of bread.
Place two of the bread slices onto the hot skillet, butter side down. Top each with 1/2 cup shredded mozzarella cheese (or 2 slices). Cook for about 3 to 4 minutes, or until the cheese begins to melt around the edges.
Using a spatula, move the bread from the skillet back to the work surface. Top one of the slices with: 1 cup spaghetti, 1/4 cup sauce, 3 meatballs, 2 tablespoons Parmesan cheese and the other cheesy slice of bread, cheese side down. Repeat this process with remaining ingredients. Cut in half and serve!