Preheat oven to 450 Degrees
Add Bisquick mix to a large mixing bowl; cut in sour cream
Pour in 7up and stir until it makes a soft dough
Use a little extra Bisquick to sprinkle onto countertop
Pat dough out and cut into biscuits (I use a small cup dipped in flour or Bisquick to easily cut biscuits)
Melt butter in an 8x8 or 9x9 inch square pan in oven
Place cut biscuits into pan and bake 12 - 15 minutes