In a large bowl, combine the first eight ingredients. Shape into 1-inch meatballs.
In a large skillet, brown the meatballs over medium heat for 8-10 minutes or until no longer pink, turning occasionally.
Drain and discard fat. Add the pepperoni, pizza sauce and olives; mix well. Bring to a boil. Reduce heat; simmer, uncovered, for 5-10 minutes or until heated through.
Transfer to a greased 13-in. x 9-in. baking dish. Top with mozzarella cheese. Arrange the toast slices over top.
Bake, uncovered, at 350° for 20-25 minutes or until cheese is melted.
Interesting Facts
This casserole dish is a great way to use up leftover sandwich bread.
Feel free to experiment with different types of cheese and toppings.
This recipe can easily be doubled or halved to suit your needs.