Begin by whisking together your flour, baking powder, and salt in a medium mixing bowl until well combined.
Cut your cold shortening into small pieces and add to the dry ingredients.
Using a hand mixer or stand mixer with a whisk attachment, blend on medium-high speed until the shortening is fully incorporated into the flour mixture.
Store your homemade Bisquick in an airtight container, or use it right away in your favorite recipe.
Notes
Keep all ingredients cold for the flakiest texture.
Don't overmix - stop as soon as the shortening is evenly incorporated.
Sift the flour first to keep your mix free of lumps.
Store in an airtight container to keep moisture out.
Label your container with the date so you know when to use it by.