Boil the eggs until hard-boiled.

Chop the broccoli into small, bite-sized pieces.

Boil the chopped broccoli lightly until tender-crisp.

Drain the boiled broccoli thoroughly.

Chop the bacon into small, bite-sized pieces.

Place the broccoli, chopped boiled eggs, bacon, and corn kernels into a gratin dish.

In a small bowl, combine the mayonnaise and whole grain mustard.

Pour the mayonnaise-mustard mixture evenly over the ingredients in the gratin dish.

Sprinkle pizza cheese and a generous amount of grated cheese over the top of the dish.

Bake in a toaster oven until the cheese is melted and golden brown.