Remove the butter from the fridge and let it come to room temperature. Prepare a cookie sheet or tray, and line out with wax paper.
Add butter into a bowl, and with your paddle attachment or hand held mixer, blend the butter until smooth. Add in the peanut butter, vanilla and salt and mix until thoroughly combined. Carefully add in the powdered sugar (you don't want it to explode all over) and mix until incorporated.
Use a cookie scoop to measure out the batter to the parchment paper.
Flatten out the candy and place the mini Reese's peanut butter cup in the center, then roll up into a small ball and place it on the lined cookie sheet. Complete all the peanut butter balls and then refrigerate for 1 hour.
Melt the chocolate candy melts in a glass or ceramic bowl: Microwave for 1 minute on high and stir, then only heat for 20 second interval at 70% power. Do not overheat the chocolate.
Use a toothpick as a handle to dip the cold peanut butter ball into the chocolate, tap off the excess chocolate, and then place it back on the cookie sheet.
The chocolate will harden quickly. Once all the treats are dipped and the chocolate is dry, place them in an airtight container and keep them refrigerated.