Cook ground beef in a large skillet over medium-high heat, stirring until it crumbles and is no longer pink. Drain.
Combine beef, 2 1/2 cups cheese, and next 3 ingredients.
Unroll each pizza crust, and cut each crust into thirds. Roll each portion to a 5-inch circle. Spread 3/4 cup of meat mixture evenly over half of each circle. Moisten edges with water; fold dough over, pressing or crimping edges to seal. Place on a lightly greased baking sheet, and cut slits in tops to allow steam to escape. Brush with olive oil.
Bake at 375° for 25 to 30 minutes or until golden. Top with Italian Tomato Sauce; sprinkle with remaining cheese. Melt cheese under broiler, if desired.
Note: Freeze baked calzones up to 1 month, if desired. Thaw in refrigerator overnight. Wrap calzones in aluminum foil, and bake at 300° for 1 hour or until thoroughly heated.