Step 1

Preheat oven to 400 degrees F. Coat an 8-inch-square baking dish with cooking spray.

Step 2

Cook macaroni according to package directions. Drain and pour into the prepared pan.

Step 3

Whisk eggs, milk, Cheddar, cottage cheese, sour cream, Parmesan, pepper and salt in a medium saucepan. Cook over medium heat, whisking frequently, until the cheeses are mostly melted, 6 to 8 minutes. Pour the custard over the macaroni, spreading evenly.

Step 4

Bake until the custard is set and the top is browned, 50 to 60 minutes. Let cool for 5 minutes before serving.