There are two ways to reheat this pretzel bites recipe:  In the microwave. Simply warm the pretzel bites in the microwave for 15 seconds if they have been kept at room temperature, 30 seconds if they have been stored in the refrigerator, and 60 seconds if they have been frozen.  In the oven. Preheat the oven to 25o degrees F. Place pretzel bites on a baking sheet or in a baking pan and cover with foil. Bake for 15-30 minutes until they are warmed through.