Whisk together the flour, baking powder, sugar and salt in a large bowl.  Cut in the shortening with a pastry blender.  I just use the edge of a large spoon to do this until the mixture resembles coarse crumbs.

Use the same amount of this mixture as you would Bisquick in a recipe.  Store in an airtight container.  I put mine in the refrigerator especially if you use butter instead of lard or shortening.

I would use the unsalted butter since you have salt already in the recipe. You could also double this recipe. This will keep 3 to 4 months.  Makes 7 1/2 to 8 cups.