Copied from: http://www.plainchicken.com/2010/04/7up-biscuits.html?m=1
Cut sour cream into biscuit mix, add 7-UP. Makes a very soft dough. Sprinkle additional biscuit mix on board or table and pat dough out. Melt 1/4 cup butter in a 9" square pan. Place cut biscuits in pan and bake at 450 degrees until golden brown.