Begin by preparing your cake batter. Mash 2 medium bananas in a large bowl, then add 1 cup flour followed by the remaining ingredients: 2 eggs, 3 tablespoons butter, 4 teaspoons sugar, 2 teaspoons baking powder, and 3/4 ounce milk.
Blend all ingredients together well until the mixture reaches a fluffy consistency. This blending step is essential for achieving the light, airy texture that characterizes this microwave cake. Once the batter is ready, let it set for 15 minutes to allow the ingredients to fully incorporate and the baking powder to activate.
After the resting period, transfer the batter into a microwave-safe bowl of your desired shape. Place the bowl in the microwave and cook on high power for 5 minutes. The cake should rise and cook through during this time, though microwave power levels vary, so check that it's fully cooked before removing.
Once finished, remove the bowl carefully from the microwave and allow the cake to cool for 5 minutes before adding the chocolate topping.
While the cake cools, prepare the chocolate dressing to complete your creation. Melt grated chocolate in the microwave for approximately 2 minutes. If the melted chocolate appears too thin, add a small amount of flour to thicken it to a spreadable consistency. Using a spatula, spread the chocolate dressing evenly over the cooled cake. The contrast between the warm, fluffy banana cake and the rich chocolate topping creates a delightful finish to this simple yet satisfying dessert.
