* 18.25 ounce boxes of cake mix have been replaced by 16.5 ounce and 15.25 ounce boxes. To compensate for the volume loss in a 16 ounce box, whisk 6 tablespoons all-purpose flour into the dry cake mix before proceeding with the recipe. To compensate for the volume loss in a 15.25 ounce box, add 1/2 cup + 3 tablespoons all-purpose flour and 1/4 teaspoon baking powder.
Almond Poppyseed Muffins: Use a white cake mix, add 2 teaspoons poppyseed and 1 teaspoon almond extract.
Chocolate Muffins: Use a chocolate cake mix and stir in 1 1/2 cups chocolate chips.
French Raspberry Muffins: Use a French vanilla cake mix and fresh raspberries.
Lemon Poppyseed Muffins: Use a lemon cake mix and poppyseed.
Spice Muffins: Use a spice cake mix with cinnamon/sugar topping.