Preheat your oven to 450 degrees F. Prepare a large roasting pan by covering it in aluminum foil. Thoroughly wash and clean the potatoes, since you'll be keeping the skins on. Slice your potatoes into wedges and place them in a large bowl.
Add kosher salt and freshly ground black pepper to the bowl, to your taste. Pour avocado or olive oil into the bowl, and toss until the potatoes are evenly covered. Place the wedges onto your pan, evenly dispersed.
Bake the potatoes for up to an hour, checking them at 45 minutes for doneness. They should be brown and crispy on the outside, and easily pierced with a fork.