Banana Cupcake

Ingredients
1 3/4 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
3/4 cup granulated sugar
1/2 cup unsalted butter, room temperature
2 large eggs, room temperature
3 large bananas, mashed
1 banana, sliced for garnish
Preparation method