Ingredients

• Nonstick cooking spray, for the pan and waffle iron
• 5 tablespoons unsalted butter
• 1 1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1/4 teaspoon kosher salt
• 1/8 teaspoon ground cinnamon
• 3 overripe bananas
• 1/4 cup granulated sugar
• 1/4 cup light brown sugar
• 1 large egg, beaten
• 1 stick (8 tablespoons) unsalted butter, cut into pieces
• 3/4 cup light brown muscovado sugar
• 1/4 cup dark rum
• 1/4 cup heavy cream
• 2 large ripe bananas, peeled and sliced into 1/2-inch pieces on the bias