For the crispiest texture, make sure the waffle maker is fully preheated before adding the batter and avoid opening it too early so the cheese can brown and set. Slice the onion very thinly so it softens quickly and blends into the cheesy batter without remaining crunchy in the center. If your batter seems too runny, stir in a little extra shredded cheddar or a small pinch of almond flour to thicken it slightly. These chaffles are very rich, so thinner portions help keep macros in check while still delivering big onion ring flavor. Feel free to add cooked bacon bits or a pinch of cayenne pepper to the batter for an extra savory or spicy twist.