A good way to reheat baked clams is to preheat your oven to 350 F or 400 F and then place the baked clams into the oven uncovered for around 10 to 15 minutes.
The oven is the best and fastest way to reheat baked clams.
Arrange the baked clams in a baking pan in a single layer and then allow them to be in the oven for 10 to 15 minutes which is usually good enough to reheat them.
The baked clams are already cooked so all you want to do is reheat them.
You could also reheat the baked clams in a toaster oven as well if you don't have a regular oven.
Or heat the baked clams back up in the microwave for a few minutes.
But it's best to reheat the baked clams using your regular oven or a toaster oven for more even heating of the baked clams.