Preheat the oven to 300°F (150°C).
Line a large baking sheet with parchment paper. If all pretzels won’t fit without crowding, use a second baking sheet.
Arrange the waffle-style pretzels on the prepared baking sheet about 1/2 inch apart.
Unwrap the Kisses and place one unwrapped Kiss on top of each pretzel.
Bake in the preheated oven for 2 to 2 1/2 minutes, watching closely, until the Kisses look glossy.
If a Kiss still seems firm in the center, return the sheet to the oven in 20-second increments until the Kiss is soft and glossy.
Remove the baking sheet from the oven. Immediately place a second pretzel on top of each glossy Kiss and press down gently to form a sandwich.
Transfer the baking sheet to the refrigerator and chill for 15 minutes to set.
Store the finished pretzel-Kiss sandwiches in an airtight container for up to 2 weeks.