Preheat oven to 450 degrees.
Blend in enough sour cream with a fork until the dough leaves sides of bowl.
Add milk to form a soft dough.
Turn dough onto lightly floured surface. Gently knead 2 to 3 times.
Roll out dough, using a floured rolling pin, to 1/2 or 3/4 inch (if you like tall biscuits). Cut using a floured 2 or 3-inch biscuit cutter.
Place on a baking sheet with sides touching for soft biscuits and 1-inch apart for crisp sides.
Bake 10-12 minutes.