Prepare the Mug Cake

1. Mix the Dry Ingredients: In a microwave-safe mug, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
2. Add the Wet Ingredients: To the dry ingredients, add the milk, vegetable oil, vanilla extract, red food coloring, and vinegar. Stir until smooth and well combined. You’ll have a vibrant red batter.
3. Microwave: Microwave the mug on high for 1 to 1.5 minutes, checking at the 1-minute mark. The cake is done when it has risen and a toothpick inserted into the center comes out clean. Don’t overcook – it should be moist!
4. Cool: Let the mug cake sit for about 1 minute to cool slightly before topping it with frosting.

Make the Cream Cheese Frosting

1. Combine the Ingredients: In a small bowl, beat together the softened cream cheese, butter, vanilla extract, powdered sugar, and a pinch of salt. Mix until smooth and creamy.
2. Frost the Cake: Once the mug cake has cooled slightly, top it with a generous dollop of the cream cheese frosting. You can swirl it on with a spoon or pipe it for a fancier look.