Whisk together all ingredients and store in airtight container--makes enough mix for 5 dozen muffins. (To make 1 dozen, whisk 1 cup milk, 2 eggs, 4 tbsp. melted butter and 1 tsp. vanilla into 2 1/4 cups muffin mix just until blended; transfer to greased muffin pan and bake at 400 degrees for 15 minutes.)
