Cook, drain, and crumble sausage.
Combine sausage,pizza sauce, onion, cheeses, oregano and garlic powder.
Separate each biscuit into 3 rounds. Top each round with about 1 tablespoon sausage mixture.
(to make ahead, place in single layer on waxed-paper lined baking sheets. Cover; freeze until firm. Transfer to freezer bags; seal and freeze.)
Place on greased baking sheet. Bake in a 425 degree oven 8-10 minutes.
Serve warm. Top with more shredded parmesan cheese. Makes approx 90