There are a few secrets to getting a perfectly fluffy, delicious breakfast casserole every time. It's best to add some sort of high-fat dairy to help soften the structure of the eggs. In this recipe, I add cottage cheese for that extra creaminess. You also need to whisk the eggs really well. Try making your egg mixture in a blender to work the eggs properly. At the same time, you don't want to over blend the eggs, which can become tough. Aim for a pale yellow colour, and you should see some foam forming on the top of the bowl.