Store any leftover roasted potatoes in an airtight container and keep them in the refrigerator for up to 4 days. You can reheat them in any preferred way (oven, stovetop, or microwave). Reheating instructions: To serve them, first, let the roasted potatoes thaw to room temperature. If using an oven, preheat to 350 degrees F, then place the potatoes for 15 to 20 mins. If you are using a microwave, reheat the roasted potatoes for 3 mins on a High power setting. For the stovetop method, place a pan on medium heat, drizzle 1/2 tbsp of oil, add the thawed potatoes, cover and heat for 8 to 10 mins, and make sure to flip the potatoes midway through the heating process.