The best way to reheat scallops is in the oven. Preheat your oven to 400° Place the scallops on a lightly greased baking sheet and put them in the top 3rd of the oven. Bake for 20-25 minutes. You want the scallops to be heated through and the bacon to be crisp, but you don’t want to overcook them so make sure to keep an eye on them. The internal temperature of the reheated scallop should be 125°.