In a large skillet over medium heat, brown the sausage. Use a wooden spoon to break it up into smaller pieces. When the sausage is halfway cooked, add in the diced onion.
Cook the sausage and onions until the sausage is no longer pink and the onions are translucent. Remove from heat and set aside.
Preheat oven to 375F degrees. Cut the biscuits into quarters.
In a 9x13 baking dish, layer the ingredients in this order: quartered biscuits, pizza sauce, browned sausage, cheese.
Bake for 30-35 minutes, until biscuits are puffed and cheese is melted.