Potato Pizza

3 cups - Mashed potatoes
1 1/2 tsp - Salt
2 Tbls - Butter
1 - Egg, beaten
1/2 cup - Parmesan cheese, shredded
6 oz - Pizza sauce
Mozzarella cheese, sliced thin or shredded
Sausage, mushrooms, pepperoni, etc.. (optional)

Mix potatoes, salt, butter, egg and Parmesan cheese.
Press into a buttered 10-inch pie plate.
Top with pizza sauce, sliced Mozzarella cheese and other favorite toppings.
Bake at 450 degrees for 20 minutes.