Line a rimmed baking sheet with parchment paper. Place the pretzel snaps in rows, salt side down.
Top each pretzel snap with an unwrapped peanut butter cup placed in the center of the pretzel. Bake at 350°F for 1 minute, just until the chocolate is glossy. Remove from oven.
op each peanut butter cup with a second pretzel, salt side up, and press down to make a sandwich.
Set the tray aside to cool, or cool in the refrigerator or freezer until the chocolate is firm.
Once the chocolate is firm, melt the white chocolate in a small saucepan or microwave safe bowl, stirring often to prevent burning. Dip the pretzels halfway into the melted chocolate, then place them back on the baking sheet.
Sprinkle immediately with candy sprinkles, mini chocolate chips, sea salt, or any other toppings as desired. Set aside to dry.