Preheat the oven to 350°F
Place the quiche on a baking sheet
Cover loosely with foil
Heat for 15 to 20 minutes
Remove the foil for the last 5 minutes if you want a crispier crust
Check that the center is hot before serving
Reheat individual slices in the microwave for 30 to 60 seconds
Use a toaster oven for smaller portions at 325°F for 10 to 15 minutes
Avoid overheating to prevent a rubbery texture