Caramelized Plantain Cupcakes with a Chocolate Hazelnut Cream Cheese Frosting

Name: Caramelized Plantain Cupcakes with a Chocolate Hazelnut Cream Cheese Frosting
Ingredients: 2 tablespoons butter, melted; 3 tablespoons brown sugar; 1/2 teaspoon ground cinnamon; 3 very ripe plantains (the peels should be entirely brown-black), peeled and sliced into 1/2-inch pieces; 1 3/4 cups all-purpose flour; 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; 1/2 cup butter, softened; 3/4 cup plus 2 tablespoons granulated sugar; 2 large eggs; 1/2 cup buttermilk; 1/2 teaspoon vanilla extract; 2 cups caramelized mashed plantains; 8 ounces cream cheese, softened; 1/2 cup chocolate hazelnut spread (recommended: Nutella); 1 teaspoon vanilla extract; 3 cups powdered sugar