Cook sausage and onion together in a skillet. Drain well and set aside.
Spray a large baking pan with non-stick spray.
Cut biscuits in half, filling with a small amount of cooked sausage. Pinch edges to seal and roll into a ball. Place in dish, touching. Repeat with remaining dough and sausage.
Meanwhile, add butter and garlic to a small bowl. Melt in the microwave. Brush over all of the sausage and dough balls.
Sprinkle shredded cheese over balls. Bake for 20-25 minutes or until edges are golden brown and cheese is melted. Serve immediately.
