- 4 tbsp all purpose flour
- 5 tbsp white granulated sugar
- 1/2 tsp baking powder
- 1 egg
- 2 1/2 tbsp unsweetened cocoa powder
- 3 1/2 tbsp milk
- splash of vanilla extract
- 3 1/2 tbsp oil
- 5 1/2 tbsp Guinness beer
Mix all ingredients into a beer mug with a small whisk or fork until batter is smooth.
Cook in the microwave for approximately 1 1/2 minutes. Make sure not to overcook or the cake becomes rubbery.