Mix the sour cream into the biscuit mix in a large bowl, using a pastry
blender or two table knives, until mixture is crumbly. Add 7-Up all at
once, stir quickly with a large fork. Turn out onto lightly floured board
and quickly knead 6-8 times. Don't over mix or biscuits will be tough. Pat
into a square and cut into about 18 equal pieces using a knife dipped in
flour. Can also use a 2 to 3 inch biscuit cutter. Preheat oven to 400 degrees
and cook biscuits for about 7 minutes.