Combine biscuit mix, margarine, and milk. Refrigerate for 30 minutes. Divide dough into two portions. Roll out on floured board. Spread with sausage and make into two long rolls. PLace in freezer long enough to harden for easy cutting. Cut in thin slices and refreeze. When ready to use thaw slices. Bake at 400 degrees. Optional ingredients: sliced stuffed olives, Pimiento, catsup, chopped parsley, chopped onion.