Preheat the oven to 375 degrees F.

Line a muffin tin with cooking oil.

Whisk the eggs and add all the ingredients. Whisk.

Fill prepared muffin cups almost to the top with the egg mixture. Grate parmesan on top.

Bake until the egg mixture puffs and is just set in the center, about 8 to 10 minutes.

Using a rubber spatula, loosen the frittatas from the muffin cups and slide the frittatas onto a platter. Serve immediately.