Cupcakes:
1 1/2 cups all-purpose flour, (spooned and leveled)
3/4 cup sugar
1 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 cup (1 stick) unsalted butter, melted
1 1/2 cups mashed bananas (about 4 ripe bananas), plus 1 whole banana, for garnish (optional)
2 large eggs
1/2 teaspoon pure vanilla extract

Frosting:
1 1/4 cup confectioners' sugar
1/2 cup (1 stick) unsalted butter, room temperature
1 tablespoon honey
1/8 teaspoon ground cinnamon