Plantain dulce de leche cupcakes

Ingredients

Cake:

• 6 tablespoons butter, softened
• 1/2 cup firmly packed brown sugar
• 2 eggs
• 1/2 cup self-rising flour
• 1/2 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon allspice
• 2/3 cup mashed plantains
• 1/3 cup dulche de leche
• 3 tablespoons milk

Dulche de Leche Buttercream Frosting:

• 1 and 3/4 cups powdered sugar
• 1 stick unsalted butter, at room temperature
• 1/2 teaspoon vanilla extract
• 3 tablespoons dulche de leche
• 1/4 teaspoon cinnamon

Bonbini:

• 2 ripe plantains, peeled and sliced
• 1 tablespoon salted butter
• 2 tablespoons brown sugar
• pinch of ground cinnamon