If the arepas are frozen, thaw them overnight in the refrigerator or by cooking them in the microwave for 1 minute (30 seconds per side). Once thawed (or if they were refrigerated), reheat them in a 350°F oven for about 10 minutes, or in an air fryer at 350°F for about 5 minutes, until they are heated through. Or you can pan fry them over medium heat for 2 to 3 minutes per side. To cook frozen, uncooked arepas, thaw them completely either in the refrigerator overnight or in the microwave, and then cook as directed in the recipe.