3Place the potatoes in a ziplock bag and then pour the butter mixture over them. Toss them until they are well coated.I use my jelly roll pan to roast these but any cookies sheet will do. I lightly spray the sheet with a non-stick spray and pour the potatoes out of the Ziplock on to the cookie sheet. Bake at 400 for about an hour, turning them every 15 mins or so until they are golden brown. Thes are not spicy they have a wonderful flavor. I hope you enjoy them as much as my family does. I also scrap every bit of the butter and horseradish I can out of the ziplock bag.