Measure out all of the ingredients. Melt the butter in the microwave for 1 minute. Preheat the oven to 180°C.
Combine the butter, sugar, egg, and milk. Add the banana to the mixture as you smash it. Mix together until there are no flour streaks.
Pour into the cake pan and bake in the oven for 40-45 minutes. When a toothpick stuck through the center comes out clean, it's done.
Story Behind this Recipe
I thought of a recipe that us child-rearing mothers could make together in our cooking club. I made this simple with pancake mix and melted butter so that anyone baking for the first time couldn't even fail. It's easy to make if using this recipe. It's a big hit.
The banana is fine if just roughly mashed. If mashing is too much work, you can just slice it and mix it into the cake batter. I used an aluminium pound cake pan (10 x 18 x 5 cm) from the 100 yen shop. The flavor of the banana will be stronger if you can held your hands on a ripe one.
Note: With the mold described above, I could slice my cake into 8-10 slices.
Since this is made with pancake mix, there's no way you can fail. Just measure the ingredients and mix until there are no flour streaks.