Mix Bisquick, sour cream and 7 Up. The dough will be very soft. Knead and fold dough until baking mix is well incorporated. Pat dough out and cut biscuits using a round biscuit/cookie cutter. Melt butter in bottom of cookie sheet pan or 9"x13" casserole dish. Place biscuits on top of melted butter and bake for 12-15 minutes or until brown at 425°F.