Mable's Mac 'n' Cheese

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

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

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.

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