Preheat oven to 425 degrees. Melt butter and pour into a 9 x 12 inch casserole dish or a sheet pan with a one-inch lip. In a large bowl, combine Bisquick, sour cream and 7 up. Mix with a large wooden spoon or spatula until thoroughly combined. (Do not use electric mixer.) Sprinkle 1 cup of Bisquick over a cutting board, in one area where you will be putting the dough. Spoon the dough onto the Bisquick and gently fold dough, incorporating the Bisquick from the cutting board into the dough. Gently pat the dough to spread out to about ½ inch thick. Using a square or round 3 inch cookie cutter, punch out dough. Place squares on top of the melted butter. Bake at 425 degrees for about 12-15 minutes or until biscuits are golden brown on top. Serve while still hot. Biscuits are delicious with butter and jelly. Makes 12 biscuits.