I used this recipe all the time when I was on the Atkins diet and still do on Sugar busters...

Legal Pizza
1 pound lean ground beef
1 jar of pizza sauce (Ragu)
2 cups of shredded mozzarella cheeese
1 can mushrooms ( if you wish)
1 small can of black olives If you wish)

Brown the ground beef and drain, stir in the pizza sauce and place into a baking dish, place cheese and toppings on it and bake at 375 till the cheese is a golden brown, and enjoy!!