In a large baking bowl mix baking powder, salt and flour together.
Use a mixer or pastry cutter to cut in butter into the flour mixture.Continue to cut butter and flour together until there are no more lumps. It should look like a coarse "lumpless" flour mixture
Store in an airtight container in the refrigerator or freezer.
Recipe by Living Chic Mom at http://livingchicmom.com/homemade-bisquick-mix-recipe/