- 6 tablespoons whole wheat flour
- 4 1/2 tablespoons white sugar
- 1/8 teaspoon baking powder
- 1/2 banana, mashed
- 3 tablespoons milk
- 3 tablespoons vegetable oil
- 1 1/2 teaspoons vanilla extract
- 2 tablespoons chocolate-hazelnut spread (such as Nutella®), or to taste (optional)
- Mix flour, sugar, and baking powder together in a bowl. Stir banana, milk, oil, and vanilla extract together in a microwave-safe bowl; stir in flour mixture until batter is smooth.
- Cook in microwave until cake is cooked through, about 2 minutes. Cool slightly and spread chocolate-hazelnut spread onto cake.