Belgian Buttermilk Waffles With Glazed Bananas

Name: Belgian Buttermilk Waffles With Glazed Bananas
Ingredients: 2 cups all-purpose flour; 2 tablespoons sugar; 2 teaspoons baking powder; 1 teaspoon baking soda; ¾ teaspoon salt; 2 cups well-shaken buttermilk; ¾ stick (6 tablespoons) unsalted butter, melted and cooled to room temperature; 2 large eggs; Vegetable oil for waffle iron; 2 tablespoons unsalted butter; 2 firm-ripe large bananas, cut diagonally into 1/3-inch-thick slices; 1¼ cups pure maple syrup; Accompaniment: sour cream or whipped cream; a waffle iron (preferably Belgian-style)