The best way to heat frozen pies is to thaw them in the fridge from the freezer overnight then pre heat your oven to 360 F.
When oven reaches temperature:
Type of pie Cold Frozen
Individual pies 20-30 mins 30-40 mins
Family pies 35-45 mins 45-55 mins
Mini pies/Sausage rolls 15-20 mins 25-30 mins
Large sausage rolls 20-25 mins 30-35 mins
Microwaving will result in soggy pastry and is not recommended.
These times are a guide only, times may vary depending on the type and efficiency of your oven. Always reheat your pie to an internal temp of at least 65-75 C or 149-167 F knife or skewer should feel hot when plunged into center for 10 seconds.