The phrase "warmed plate" means a plate that has been heated beforehand to make the food on it stay hot for longer.
Sentences with «warmed plate»
Serve pancakes immediately on warmed plates, with the syrup and preserves on the side. (health.com)
One approach we discovered that has never been rejected the many hundreds of times we have used it is a freshly baked, slightly warm plate of cookies. (redeeminggod.com)
Cook for a further 1 minute, then transfer to warm plate in the oven. (thekitchenrebellion.com)