Preheat oven to 400 degrees.
Wash potatoes and pat dry. Pierce potatoes with a fork.
If desired whisk an egg white until frothy or use olive oil and brush the potatoes.
Then roll the potato in a combination of kosher salt, ground black pepper, rosemary and thyme. I usually sprinkle spices on a cutting board and roll the potato around on it.
Bake potatoes for about 60 minutes, until tender.
Remove from oven and let sit until cool enough to handle.
Adjust oven temperature to 350 degrees.
Use a small knife and cut around the top of the potato. You are trying to make a bowl of sorts.
Remove the top of the potato.
Use a small spoon to scrape out the inside of each potato into a mixing bowl, leaving a thin edge for support.
Place potato pulp in a mixing bowl.
Mash to desired consistency. Use a handheld mixer if possible.
Add in butter, cream, garlic, parmesan, salt and pepper. Set bowl aside.