Peanut butter and chocolate pretzel bites

I made this dessert as a treat for my partner intended to last a few weeks, but she's chowing through them alarming quickly...

Peanut butter and chocolate pretzel bites

Ingredients (makes about 25):

1/2 cup creamy peanut butter
1 tbsp melted butter
1/3 cup powdered sugar
1/4 cup brown sugar
About 50 mini pretzels
10 oz semi-sweet chocolate
1/4 cup milk

1. In a bowl, mix peanut butter, butter, powdered sugar, and brown sugar (if you have a mixer, even better, but I don't). Mix it all as best you can.
2. Sandwich a bit of the mixture between 2 mini pretzels, and so on, and set on a plate or baking sheet. Freeze for 30-45 minutes.
3. Chop chocolate. Then add milk and chocolate to a skillet over medium heat. Stir over heat until completely smooth.
4. Pour chocolate into a bowl for easy dipping, or use the skillet, and dip each pretzel bite halfway.
5. Return pretzel bites to a plate or baking sheet, and refrigerate until the chocolate sets.