In a medium bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. In a 2 cup liquid measuring cup, measure out the buttermilk, then whisk in the eggs and extract. Pour the wet ingredients into the dry bowl and gently stir. Before it’s smooth, add the butter and continue to stir to form a thick batter.

Heat a waffle iron and spray with cooking spray. Scoop the batter onto the iron and cook until nicely browned and crisp.