Bring the butter to room temperature and preheat the oven to 170℃. Peel the banana and mash well with a fork.
Grind the tea leaves finely in mortar.
Cream the butter in a bowl, add the sugar and mix until they turn white.
Add the ground tea leaves. It's easier to do it with a pastry brush.
Add the egg and banana, and mix well. Sift in the flour and baking powder, and mix with a spatula.
Fill 80% of the baking cups with the batter and bake in the oven for 25 minutes.
They are done.
They are also tasty if you add white chocolate. Reduce the sugar to 35 - 40 g and add 30 g of white chocolate to bake.
They also taste good with matcha instead of earl grey tea. Combine 4 g of matcha, 35 - 40 g of sugar and 30 g of chopped white chocolate to bake.
Story Behind this Recipe
I'm into baking banana cakes and I've been experimenting by using less butter, adding tea leaves, etc. Finally I came up with this recipe. At first, I put in tea leaves as they were, but they lost their aroma and the texture was not good. So I tried with ground tea leaves.
Be sure to grind the tea leaves. By doing so, it improves the aroma and texture. If you want to increase the tea aroma, you can add 2 tea bags and it's also delicious . Adjust the amount of sugar depending on the sweetness of the banana. You can make banana muffins without the tea leaves and they are also delicious .