Heat oven to 400. Spray a 9 x 13" baking pan w/ cooking spray. In lg skillet, sprayed w/ cooking spray, cook sausage, red bell pepper and onion over medium heat, stirring until sausage is fully cooked.
In baking dish, mix sausage mix, potatoes and 1-1/2 cups cheese.
In bowl, stir together bisquick mix, pepper, milk and eggs. Mix well. Pour over sausage mix. Bake 30 min, or until a knife inserted in center comes out clean. Sprinkle w/ remaining cheese and bake until cheese is melted.