Waffles are just pancakes with abs 😉
Our recipe for crisp, fluffy buttermilk waffles starts with replacing some of the buttermilk with a combination of powdered buttermilk and seltzer, which inflates the batter. Adding some baking soda to the recipe gave us buttermilk waffles that were perfectly browned. Using oil in the batter instead of butter kept the buttermilk waffles crispy because the oil’s fat repelled whatever interior moisture managed to rise to the surface of the waffle to soften the dry crust.
Source: Best Buttermilk Waffles
One thing to keep in mind: make sure you use actual seltzer or club soda, not sparkling water. La Croix may be the best known cure for Diet Coke addiction, but Cook’s Illustrated warns that it’s just not bubbly enough for this application.