Combine the meat, crumbs, ¼ cup tomato sauce, egg, garlic, onion, and seasonings. Blend lightly but thoroughly.
Butter a square of aluminum foil, place the mixture on it, and mold into a flat round cake until it looks like a medium size pizza. Shape a rim on the foil to keep the sauce from spilling over. (If using leftover mashed potatoes, spread a layer on top of the hamburger mixture.) Spread with ½ cup tomato sauce, slices of cheese, anchovy, and olives. Sprinkle with grated Parmesan cheese and more basil and oregano to your taste.
Slide the “pizza” onto a cookie sheet, foil and all. Bake at 450° about 15 minutes, or a bit less if you prefer your meat pink.
Optional: Parmesan mashed potatoes
Additional basil or oregano
(Note: Double this and use a sheet pan. Or use jarred pasta sauce you love. Feel free to use your own favorite pizza toppings, ground turkey instead of beef—have fun with it!)