In a large bowl, mix together the flour, baking powder, baking soda, salt, and sugar.
In another bowl, mix together the buttermilk, butter, and eggs.
Whisk the liquid ingredients into the dry ingredients, and stir until just combined.
Heat up the waffle maker.
Once heated, either spray with cooking spray or rub with butter (I usually use cooking spray).
Scoop the batter into the wafflemaker and cook until lightly golden–amounts will vary based on the size of the waffle maker.
Keep waffles warm while making the rest by placing them on a baking sheet and placing them in the oven in it’s “warm” setting, or around 160 degrees.
Repeat until all of the batter is used to make the waffles.
Serve!