Preheat the oven to 350°F (180°C) and grease a muffin tin.
In a mixing bowl, whisk together the eggs, parmesan cheese, heavy cream, salt, and pepper.
Divide the bacon, cheddar cheese, and green onion among the muffin cups.
Pour the egg mixture over the fillings in each cup.
Bake for about 20-25 minutes or until the egg cups are set and slightly golden.
Allow them to cool slightly before serving. Enjoy!