Bubble Pizza

This is my granddaughter's most requested meal when she comes to visit. It's a meal in itself, but a salad would go nice with it. Have fun experimenting with your favorite pizza toppings.
PREP TIME 20 Min
COOK TIME 30 Min
READY IN 1 Hr

Ingredients:
1 pound ground beef
1/4 pound sliced pepperoni sausage
1 (14 ounce) can pizza sauce
2 (12 ounce) packages refrigerated buttermilk biscuit dough
1/2 onion, sliced and separated into rings
1 (10 ounce) can sliced black olives
1 (4.5 ounce) can sliced mushrooms
1 1/2 cups shredded mozzarella cheese
1 cup shredded Cheddar cheese

Directions:
1. Preheat oven to 400 degrees F (200 degrees C). Grease a 9x13 inch baking dish. Place ground beef in a large, deep skillet. Cook over medium high heat until evenly brown. Stir in pepperoni, and cook until browned. Drain excess fat. Stir in pizza sauce. Remove from heat, and set aside.
2. Cut biscuits into quarters, and place in the bottom of baking dish. Spread meat mixture evenly over the biscuits. Sprinkle top with onion, olives and mushrooms.
3. Bake uncovered in preheated oven for 20 to 25 minutes. Sprinkle top with mozzarella and Cheddar cheese. Bake an additional 5 to 10 minutes, until cheese is melted. Let stand 10 minutes before serving.