1
Adjust rack to top position and preheat oven to 450 degrees. Wash and dry produce.
Halve, peel, and thinly slice onion; mince a few slices until you have 2 TBSP (4 TBSP for 4 servings). Halve buns.
Cut potatoes into ¼-inch-thick rounds. Toss on a baking sheet with a large drizzle of oil, half the Fry Seasoning (you’ll use the rest later), salt, and pepper. Arrange in a single overlapping layer.
Roast on top rack until lightly browned, 20 minutes (you’ll add more to the sheet then).