Heat oven to 425. Grease pie plate, 10 x 1 1/2" Sprinkle 2/3 c. Onion and 1/3 c. Parmesan cheese in pie plate. Beat milk, eggs and bisquick 15 sec. In blender on high. Pour into pie plate. Bake 20 min.
Spread pizza sauce over top. Top with remaining ingred. Bake 15-20 min. Or til cheese is light brown. Cool 5 min. For 1/2 recipe: Use 1 qt. Square or round casserole. Decrease Parmesan cheese to 2 tb., eggs to 2 and baking mix to 1/2 c. Divide remaining ingred. Amts in half. Decrease beat time to 10 sec. and second baking time to 10-15 min. High Alt>For 1/2 recipe: use 1 1/2 qt round or 1 qt. Square casserole.
