First, heat the oven to 425°F and coat an 11x7 inch baking pan with non-stick spray.
Next, spread the potatoes out onto a layer of paper towels and squeeze them to remove as much moisture as you can.
In a mixing bowl, combine the potatoes, 1/2 cup of cheese, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. When that is well combined, press the mixture into the pan and up the sides of the dish to create a crust.
Bake that crust at 425 degrees F until it's lightly browned.
Now, remove the crust from the oven and reduce the temperature to 375 Degrees F.
In your mixing bowl combine the eggs, remaining cheese, the rest of the salt and pepper, and whisk. Stir in the scallions and the frozen corn.
Add that mixture into the potato crust and bake for about 30 minutes. Let the casserole stand for 5 minutes before you cut and serve it!