To keep these chaffles strictly keto, always choose sugar-free deli ham and avoid any varieties glazed with honey or brown sugar. A mini waffle maker works best to create consistently crisp chaffles, but a full-size waffle iron can be used by cooking the batter in batches and leaving extra space so the cheese can brown instead of steam. If your chaffles turn out soft, cook them a bit longer until the cheese is a rich golden brown, then cool briefly on a wire rack to let steam escape and the edges firm up. The batter can be mixed up to one day in advance and stored in the refrigerator, then stirred before cooking. Feel free to customize with a pinch of smoked paprika, diced jalapeños, or swapping ham for turkey or bacon, keeping additions small so the chaffles stay crisp and low in carbs.