Preheat over to 425°F.
Mix Bisquick, sour cream and 7 up. Dough will be very soft - don't worry.
Sprinkle some Bisquick on a flat surface, turn dough out on it, knead and fold dough until coated with your baking mix. Pat dough out on a floured surface to about 1/2 inch thickness, and cut biscuits using a round biscuit / cookie cutter.
Melt butter in bottom of cookie sheet pan or 9x13 casserole dish. Place biscuits on top of melted butter and bake for 12-15 minutes or until brown at 425°F