Begin by washing all potatoes and peeling if desired.
For sweet potatoes, preheat the oven to 400°F (200°C) and cut into cubes. Toss with oil, salt, and pepper before roasting for 20 minutes.
For russet potatoes, preheat the oven to 375°F (190°C) and cut in half. Brush with oil and bake for 40 minutes, flipping halfway through.
For red potatoes, boil a pot of water and add halved or quartered potatoes. Cook for 15-20 minutes until fork-tender.
For fingerling potatoes, preheat the oven to 425°F (220°C) and cut in half lengthwise. Toss with oil, salt, and pepper before roasting for 15-20 minutes.
For purple potatoes, preheat the oven to 375°F (190°C) and cut into chunks. Toss with oil, garlic powder, and Italian seasoning before roasting for 25 minutes.
Once all potatoes are cooked, use them as desired in recipes as a substitute for Yukon Golds.