Using an oven is the best way to reheat McDonald's fries. While the preheating part can be time-consuming, your oven can yield evenly heated, crisp fries that almost taste fresh.

Preheat your oven to 425 or 450 degrees F, spread the fries evenly in a single layer on a lightly oiled baking sheet, and bake on the center rack for three to four minutes.

You can shake the tray or flip the fries halfway through, but the cook time is quite short, so you don't necessarily need to. Remove the fries when they look a little extra golden.