In a large bowl and with an electric mixer, beat the butter on medium speed until smooth.
Mix in the peanut butter and powdered sugar on low speed, followed by the rice krispies.
Form the dough into balls about 1 inch in size. Place on a parchment paper lined cookie sheet, cover in plastic wrap and refrigerate for at least 20 minutes, or preferably 1 hour.
Add the chocolate chips to a medium, heat proof bowl. Microwave on medium power for 30 seconds, remove from the microwave and stir. Repeat the process until the chocolate is melted and completely smooth.
Using a fork or candy dipping tool, dip each ball in the melted chocolate. Gently shake off any excess and place back on the lined cookie sheet.
Let set at room temperature for 1-2 hours, or in the fridge for 30 minutes.
Notes
If the dough is too soft or too sticky to work with, pop the bowl into the fridge for about 20 minutes (or up to 24 hours) so it can firm up.
Another way to make sure the pb balls hold their shape is to roll them and freeze them on a baking tray for about an hour, then dip them into the chocolate.
Store in an airtight container. They should stay fresh at room temperature for up to 2-3 days or in the fridge for up to 2 weeks.
To freeze, arrange them on a parchment paper lined baking sheet and freeze for 1-2 hours or until fully frozen. Then transfer to a freezer-safe container and store for up to 3 months. Thaw overnight in the fridge or for an hour on the counter.