5-Minute Red Velvet Mug Cake

When a red velvet craving hits but you don’t have time to bake a whole cake, this mug cake is the answer. It comes together in 5 minutes with basic pantry staples, and you get that signature cocoa-vanilla tang plus a quick cream cheese frosting right on top.

The microwave does all the work, and the cake stays tender and moist. It’s an ideal little treat after dinner or whenever you want something warm and chocolatey without a pile of leftovers.

What Makes This Mug Cake So Good

It tastes like real red velvet, not just chocolate cake with red dye. The cocoa is subtle, the tang from the buttermilk comes through, and the cream cheese frosting ties it all together.

Even though it’s cooked in a microwave, the texture is genuinely tender. A quick stir and a short blast of heat give you a warm single serving that hits the spot.

Ingredients

• 4 tbsp all-purpose flour: standard white flour, spooned and leveled
• 3 tbsp granulated sugar: plain white sugar keeps the crumb light
• 1 tsp cocoa powder: natural or Dutch-processed both work
• 1/4 tsp baking powder: gives the cake lift in the microwave
• Pinch of salt: balances the sweetness
• 3 tbsp buttermilk: use store-bought or a quick mix (see Variations)
• 1 tbsp vegetable oil: any neutral oil, can sub melted coconut oil
• 1/4 tsp vanilla extract: for the classic red velvet backnote
• 1/2 tsp red gel food coloring: gel gives a brighter red with less liquid; liquid works too
• 2 tbsp cream cheese, softened: full-fat block cream cheese is best for frosting
• 1 tbsp powdered sugar: for the frosting, plus a little more if you like it sweeter
• Additional 1/4 tsp vanilla extract: just for the frosting

Variations / Substitutions

• Buttermilk swap: stir 1/2 tsp white vinegar or lemon juice into 3 tbsp milk, let sit 5 minutes.
• Skip the food coloring: the cake will taste just as good; it’s essentially a mild chocolate mug cake without the red.
• Dairy-free: use a plant-based milk plus vinegar for the buttermilk, vegan cream cheese, and a neutral oil.
• Frosting alternative: if you don’t have cream cheese, whisk 2 tbsp powdered sugar with a few drops of milk for a quick glaze.
• A little extra richness: fold a few white or dark chocolate chips into the batter before microwaving.

If you enjoy this, try my Classic Red Velvet Cupcakes.

How to Make Red Velvet Mug Cake

Step 1: Mix the Dry Ingredients

In a 12-ounce microwave-safe mug, whisk together the 4 tbsp flour, 3 tbsp sugar, 1 tsp cocoa powder, 1/4 tsp baking powder, and a pinch of salt. A fork or tiny whisk both work, just break up any cocoa clumps.

You want the mixture to look uniformly pale brown with no white streaks of flour. If the cocoa is lumpy, press it against the side of the mug with the fork tines.

Step 2: Stir in the Wet Ingredients

Pour in the 3 tbsp buttermilk, 1 tbsp oil, 1/4 tsp vanilla, and 1/2 tsp red food coloring. Stir with the fork until you have a smooth, thin batter.

Scrape the bottom of the mug well. Dry pockets like to hide in the corners, and they’ll bake into hard spots. The batter will be bright red and a little runnier than pancake batter, which is exactly what you want.

Step 3: Microwave the Cake

Place the mug in the microwave and cook on high for 60 seconds. After that, check the top. If it still looks wet in the center, microwave in 15-second bursts until it’s done. Most 100-watt ovens finish around 90 seconds total.

The cake will rise and pull away slightly from the sides. When it’s ready, the top looks set but still a little glossy. The cake keeps cooking from its own heat after you take it out, so stopping when it’s just barely set keeps the crumb tender. Let it sit for a minute while you mix the frosting.

Step 4: Top with Cream Cheese Frosting

While the cake rests, in a small bowl stir together the 2 tbsp softened cream cheese, 1 tbsp powdered sugar, and the extra 1/4 tsp vanilla. Mix until smooth with no streaks of cheese.

Dollop the frosting right onto the warm cake, and use the back of a spoon to spread it a little if you like. Eat it straight from the mug while it’s still warm.

A Few Notes Before You Start

• Use a mug that holds at least 12 ounces. Anything smaller will overflow as the cake rises, and microwave clean-up is no fun.
• Don’t overmix the batter. Stir just until no dry flour remains. Overworking it can make the cake tough.
• Let the cream cheese soften on the counter while you measure the dry ingredients. Cold cream cheese won’t mix into a smooth frosting easily.

Microwave wattages vary, so use these times as a guide:

Frequently Asked Questions

Can I bake this in the regular oven?

Yes. Pour the batter into a small oven-safe ramekin and bake at 350°F for 12 to 15 minutes, until the center is set.

Why did my cake overflow?

The mug was probably too small. Use one that holds at least 12 ounces so there’s room for the cake to rise.

Can I make this gluten-free?

You can. Swap the flour for a 1:1 gluten-free baking blend. The texture will be a little denser, but it still works.

Red Velvet Mug Cake Recipe

Print Recipe Pin Recipe

Prep Time 3 minutes mins

Cook Time 2 minutes mins

Total Time 5 minutes mins

Servings: 1 servings

Calories: 520

Ingredients Method Notes

Ingredients

  

• 4 tbsp all-purpose flour
• 3 tbsp granulated sugar
• 1 tsp cocoa powder
• 1/4 tsp baking powder
• Pinch of salt
• 3 tbsp buttermilk (or 3 tbsp milk + 1/2 tsp white vinegar)
• 1 tbsp vegetable oil
• 1/4 tsp vanilla extract
• 1/2 tsp red gel food coloring
• 2 tbsp cream cheese, softened
• 1 tbsp powdered sugar
• Additional 1/4 tsp vanilla extract

Method

 

1. In a 12-ounce microwave-safe mug, whisk together flour, sugar, cocoa, baking powder, and salt.
2. Add buttermilk, oil, vanilla, and food coloring; stir until smooth, scraping the bottom.
3. Microwave on high for 60 seconds, then check and add 15-second bursts until the top is set but slightly shiny (about 90 seconds total). Let rest 1 minute.
4. Stir together cream cheese, powdered sugar, and the extra vanilla; dollop onto the warm cake.

Notes

The cream cheese frosting is optional but adds that classic tang. If you skip it, a quick powdered sugar glaze (2 tbsp powdered sugar plus a few drops of milk) works nicely on the warm cake. This cake is best eaten right away while it’s still warm.