Coffee Mug Cake

Ingredients

• 1 tablespoon butter, softened
• 2 tablespoons white sugar
• 1/2 beaten egg
• 2 tablespoons sour cream
• 2 drops vanilla extract, or more to taste
• 1/4 cup all-purpose flour
• 1/8 teaspoon baking powder
• 2 tablespoons all-purpose flour
• 1 tablespoon brown sugar
• 1 teaspoon cinnamon
• 1 tablespoon butter

Directions

Stir 1 tablespoon softened butter and white sugar together in a coffee mug until fluffy; stir egg, sour cream, and vanilla extract into the butter mixture. Add 1/4 cup flour and baking powder into the mixture; stir until smooth.

Mix 2 tablespoons flour, brown sugar, and cinnamon together in a bowl. Mash 1 tablespoon butter into the flour mixture with a fork or pastry cutter until mixture is crumbly; sprinkle over the cake batter in the mug.

Cook in microwave oven on high for 1 minute. Continue cooking in 10-second intervals until a toothpick inserted into the middle comes out clean.