Preheat oven to 350°F (175°C) and grease a 9×9-inch baking dish.
In a large mixing bowl, whisk together eggs, cottage cheese, milk, cheddar cheese, salt, and pepper.
Stir in any optional add-ins for added flavor.
Pour the mixture into the prepared baking dish.
Bake for 25–30 minutes, or until the center is set and a knife comes out clean.
Let cool for 5 minutes, then slice and serve.
