I own a pie company, and I recently set up a kiosk. In the kiosk we have a food warmer that we use to display our product. We are encountering a problem that I do not know how to fix. When we set the temperature to 60 degrees celsius (the minimum needed to ensure food safety), the pies shrink considerably and look dried out after 4 to 6 hours. I tried adding a very small dish of water, but it has not helped. The pies still end up dried out. We have two different types of pies in the warmer: Dessert and Savory.
Is there anything that we can do to prevent the shrinkage and drying out? I don't want to leave the warmer off because I am worried that bacteria could grow.
Here is the model warmer that we are using: