If you have purchased a ready-cooked pie from the grocery store, it is not necessary to cook it again in the oven. Ready-cooked pies are intended to be fully cooked and safe to eat without any additional cooking.
The packaging or label on the pie should provide instructions on how to serve and enjoy it. In most cases, you can simply remove the pie from its packaging and serve it at room temperature or follow any specific instructions provided by the manufacturer.
Cooking a ready-cooked pie again in the oven could potentially overcook or dry out the pie, affecting its texture and taste. It's essential to follow the instructions provided with the product to ensure that it is enjoyed at its best quality.
If you have any doubts or concerns about the preparation or serving of the pie, you can always contact the store where you purchased it or refer to the manufacturer's guidelines on the packaging.