Easy Buttermilk Biscuits

2 1/4 cup baking mix (bisquick)
2/3 cup melted butter
2/3 cup buttermilk
1 teaspoon sugar, optional

Preheat oven to 450 degrees.  In a large bowl, mix together all ingredients. Turn out
onto floured surface and knead a few times. Spread out onto surface to about 1/2 inch
thickness.  Cut into rounds with biscuit cutter.  Bake for about 8 minutes or until golden.
Brush tops with a little melted butter if desired.