In a large bowl, mix together all the dry ingredients.Store in an airtight container for up to 6 months.
This one big batch is meant to be portioned out — think of it as eight batches' worth of muffins waiting in the wings, not eight jars. Scoop out what you need, when you need it.
To Prepare One Batch
Preheat the oven to 400°F.Base for every batch:Stir together, then fold in whatever add-ins you're in the mood for that day — berries, chocolate chips, chopped apple, nuts, whatever's on hand. Fill paper-lined muffin cups three-fourths full.Bake at 400°F for 18–21 minutes, until a toothpick inserted in the center comes out clean. Let the muffins cool in the pan for 5 minutes before moving them to a wire rack. Serve warm.2 cups mix½ cup shortening or oil¾ cup milk2 eggs1 teaspoon vanilla