Arrange bread slices in a single layer in an ungreased 9x13-inch baking dish. Fill in any gaps with pieces of bread.
In a bowl, combine cream cheese, mayonnaise and seasonings. Spread mixture over bread slices.
Sprinkle with 1/2 cup shredded mozzarella cheese.
Gently mix together spaghetti sauce and meatballs. Spoon over cream cheese layer.
Sprinkle the top evenly with remaining shredded cheese.
Bake uncovered for 30-35 minutes. If you notice it is getting too brown, just loosely cover it with some aluminum foil.
Allow to cool for a few minutes then slice and serve.
Video
Notes
Please refer to my FAQ’s and ingredient list above for other substitutions or for the answers to the most common questions.
For a firmer bread base, I recommend toasting the bread first. You can place the dish into the oven (on the broiler setting) and toast both sides. It should only take a minute or two.
Note: frozen meatball packages come in varying sizes - anywhere from 18 ounces to 32 ounces. This recipe will accommodate most of those sizes. As long as you are grabbing a standard size bag and not a family size bag, it will work.