Using a pie or pastry blender, mix Pioneer Biscuit Mix with sour cream and Sprite or 7-Up. Sprinkle extra biscuit mix onto a pastry sheet or wax paper and add dough. Press down dough and use a biscuit cutter to cut biscuits. Melt butter in an iron skillet and dip cut biscuits in skillet. Then place biscuits on a baking sheet. Cook in oven at 375°F for 20 minutes or until golden brown.