Roll or pat biscuits into 2½-inch circles. Place on greased baking sheets
In a small bowl, combine the tomato sauce, onion, oregano, basil and garlic powder; spread over biscuits. Bake at 400 degrees for 8–10 minutes or until edges are lightly browned.
Meanwhile, using a small ghost-shape cookie cutter, cut a ghost out of each cheese slice. Immediately place a ghost over each pizza; add pieces of olives for faces.