Make waffles:
Put oven rack in middle position and put a large metal cooling rack directly on it. Preheat oven to 250°F and preheat waffle iron.
Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl.
Whisk together buttermilk, melted butter, and eggs in another bowl, then whisk into flour mixture until just combined.
Brush hot waffle iron lightly with vegetable oil and pour a slightly rounded 1/2 cup of batter into each waffle mold (see cooks'' note, below). Cook waffles according to manufacturer''s instructions until golden and cooked through, about 3 minutes. Transfer as cooked to rack in oven to keep warm, keeping waffles in 1 layer to stay crisp. Make more waffles in same manner.
Read More http://www.epicurious.com/recipes/food/views/Belgian-Buttermilk-Waffles-with-Glazed-Bananas-232170#ixzz1Osl2mqis