When you have a cooked pie and it's frozen all you need to do is heat it up.
So you can put the cooked pie in the oven for 10 minutes to 20 minutes to thaw it out and have it ready to eat.
To prevent overcooking the already cooked pie it's best to thaw the cooked pie out overnight in the fridge and then cook it in the oven.
Allowing the pie to thaw first helps the pie heat up faster without potentially burning or overcooking the pie.
If you want to cook the cooked pie from frozen then make sure to preheat the oven to 350 F and then place the cooked frozen pie in the oven.
Set at timer for 10 minutes and then check on the pie so that it does not burn.
If it's not heated up enough then cook it for another 5 minutes to 10 minutes and check it again.