There are three additional ingredients you need to make this casserole eggy perfection. One is butter, which you’ll use to coat your baking dish, but also mix it into the eggs once melted to add flavor. After all, who doesn’t love an egg fried in butter?
Beyond that, there are two cheeses this recipe calls for. A sharp cheddar cheese is mixed into the eggs and even sprinkled across the top. Cheddar is an excellent match with egg dishes, but so are cheeses like Monterey Jack and Swiss. If you choose to swap cheddar for another cheese, just be sure to use a good melting cheese that pairs well with the mix-ins you’re adding.
The second cheese is mascarpone, a creamy and smooth, but neutral cheese that resembles cream cheese. When softened and beaten into the eggs, it provides a fluffy texture and creamy flavor to the baked casserole. If you’re in need of a substitute, a drained ricotta or small curd cottage cheese, drained of excess liquid, would also work.