Place a small custard cup or a microwave ring mold in the center of a deep-dish 9-inch glass pie plate sprayed with olive oil-flavored cooking spray.
Mix together the meat, bread crumbs, onion, green pepper, mushrooms, olives, 1/2 cup tomato sauce, and 1 teaspoon Italian seasoning in a large mixing bowl. Spread this mixture evenly into the pie plate.
Stir remaining 1 teaspoon Italian seasoning and sweetener into the remaining tomato sauce, and spread over the meat mixture.
Microwave on HIGH for 10 minutes, and then sprinkle the mozzarella cheese over the top.
Turn dish and microwave on HIGH for an additional 8 minutes.
Remove from microwave and let set for 5 minutes before cutting into 6 servings.