The 321 mug cake is an incredibly versatile and easy dessert to make, especially when combining angel food cake mix with devil’s food cake mix, or any other flavor you prefer. The name “321” refers to the ratio of ingredients: three tablespoons of the cake mix combination, two tablespoons of water, and one minute in the microwave. To prepare, mix equal parts of angel food cake mix and your chosen cake flavor—be it devil’s food, chocolate, vanilla, or any other—in a large container. When you’re ready for a treat, simply take three tablespoons of this mixture, add two tablespoons of water, stir until smooth, and microwave on high for one minute. The angel food cake mix provides a light and airy texture, while the additional flavor brings variety and richness, resulting in a delightful single-serving cake perfect for any occasion