Combine potatoes and sauce mix in 1½-quart baking dish. To Serve: 1. Traditional Oven Directions. Store in airtight container. Bake uncovered for 25 minutes or until top is golden brown and potatoes are tender. butter or margarine with whisk. Makes 1 "box". 2. You'll be saying, 'move over boxed potatoes' once you try these cheesy au gratin potatoes cooked to perfection in your multi-functional pressure cooker. Handle dish with care. Preheat the oven to 350°F and set an oven rack in the middle position. Since 1951, Idahoan’s mission of innovation continues to bring you quality 100% REAL Idaho potatoes in all the ways you love. Stir in milk. DIRECTIONS. Whether you’re looking for your traditional comfort food, or wanting new excitement in your life, Idahoan delivers. Stir in 1½ cups boiling water, ¾ cup milk, and 1 Tbsp. Caution: Dish and potatoes in microwave will be very hot and steam will be present. Combine all ingredients together. Each order includes 3 boxes of Au Gratin and 3 boxes of Scalloped Potatoes for 30 total servings. Place 2 cups dehyrated potatoes, 4 cups of water water, and au gratin mix together in a casserole dish. Grease an 8-inch (or 2-quart) baking dish with butter. ; In a large mixing bowl, toss the Bake uncovered at 350*F for 45-60 minutes. For a little bit of kick, use pepper Jack cheese in place of the Monterey Jack. Heat oven to 450 degrees F. Combine potato slices, sauce mix, boiling water and margarine into a 1 1/2-quart casserole dish. Preheat oven* to 450°F.