Tip: It’s best to let your cold ingredients like eggs and buttermilk get to room temperature. Take out the eggs and measure out the buttermilk. Let it sit on the counter for about 30 minutes.
Whisk eggs, buttermilk, and sugar together until smooth. Whisk in vanilla extract and melted butter.
Sift flour, baking powder, and baking soda together and add it to the wet ingredients. Add salt and whisk all ingredients together until evenly combined.
Let the batter sit for 10-15 minutes while preheating the waffle maker.
Lightly grease the waffle maker with oiled paper towel (not a cooking spray) and cook waffles in a waffle maker per your waffle maker's instructions.