Preheat oven to 400˚F. Brush a deep dish 10-inch cast iron skillet or pie dish with 1 Tbsp melted butter. (You can use any similar oven safe skillet)
To make Crust: In a medium mixing bowl, mix together hash browns, Parmesan cheese and beaten egg until combined. Press hash browns firmly onto bottom and up sides of prepared skillet. Bake until lightly golden brown, about 15 to 20 minutes. Remove from oven and let cool slightly. Lower oven temperature to 350°F.
To Assemble: Spread chopped Canadian bacon, green onions and 1 cup cheddar cheese on bottom of crust.
In large mixing bowl whisk together eggs, half and half or heavy cream, salt, black pepper, granulated garlic, onion powder and nutmeg until well combined.
Pour egg mixture evenly over Canadian bacon and crust. Sprinkle remaining cheddar cheese on top. (You can use more than 1/2 cup cheese on top, if desired)
Transfer to the oven and bake at 350°F until center has puffed up and eggs are set when the skillet is gently shaken, about 30-40 minutes.
Remove from oven and let stand for 20 minutes before cutting and serving garnished with parsley.