In a large bowl whisk together dry ingredients: flour, sugar, salt and baking soda.
In another bowl whisk together wet ingredients: buttermilk, eggs and melted butter.
Pour the wet ingredients into the dry and whisk together until all lumps disappear and batter is slightly thickened, about 1 minute.
Pour batter on preheated waffle iron, close and bake according to waffle iron directions, about 3 minutes.**
Set cooked waffles on a wire rack inside a baking sheet to avoid steaming.
Preheat oven to 200°F then turn it off. Keep waffles in warm oven while cooking.
Serve with butter, syrup, fresh fruit or any toppings you like.