Preheat oven to 400 F.
In a mixing bowl, combine the ground beef, egg and breadcrumbs. Add the meat mixture to a 9" round baking dish and press evenly into the dish.
Bake in the preheated oven for 40 minutes, or until meatloaf is cooked through in the middle.
Note: if need be, scrape off any extra fat from the top of the meatloaf, before adding pizza toppings.
Once meatloaf is baked, spread the pizza sauce directly onto the "meatloaf crust," then add shredded cheese and preferred pizza toppings.
Return to the oven for 10 minutes. Cut into "pizza slices" to serve.
Serve Pizza Meatloaf with veggies.