I make these a lot as they are so very easy..
Any kind of potatoes will do 🙂
I then grated garlic/sea salt all over them and squished the bag all around.
I then poured the potatoes into a greased pan (with sides). I spread fresh rosemary all over the top.
Place in a preheated (425) oven for about 35-30 minutes.
I then removed from the oven, grated parmesan cheese all over the top (with my trusty microplanar!) and stuck back in the oven for about 5 more minutes.