Combine bacon, cheese and onion; set aside. Cut biscuits into fourths, dip each piece in butter and layer one third in a lightly greased 10 inch bundt pan. Sprinkle half of bacon mixture over biscuits, repeat, ending with biscuits on top. Bake at 350 degrees for 40 minutes or until golden brown. Cool 10 minutes in pan. Invert onto a serving platter and serve immediately.