For a slightly different texture, you can swap half of the cheddar for a softer cheese like Monterey Jack or mozzarella; just keep the total amount of cheese the same so the casserole sets properly. If you prefer a smokier profile, use smoked cheddar or smoked gouda in place of regular cheddar. To lean into a more traditional Midwestern feel, sprinkle a pinch of dried mustard or a dash of paprika into the egg mixture—this won’t change the low-carb nature but will add gentle warmth. For make-ahead mornings, assemble the casserole the night before, cover tightly, and refrigerate; in the morning, let it sit on the counter while the oven preheats, then bake, adding a few extra minutes if it’s very cold. Leftovers keep well in the refrigerator for up to 4 days and reheat nicely in a low oven or toaster oven, where the top will crisp again. If you need to stretch the servings slightly without adding carbs, whisk in one extra egg and bake in a slightly larger dish, watching the time so it doesn’t overcook.