Line a baking sheet with parchment paper. Set it aside.
In a microwave-safe bowl, add the peanut butter and the butter.
Cover the bowl with plastic wrap and pierce a few holes on top using a knife to release any steam.
Microwave on high for 30 seconds. Take it out of the microwave, remove the plastic wrap, and stir the mixture well.
Gradually sift the powdered sugar over the peanut butter mixture. Use a hand mixer to combine everything well. It should resemble stiff dough so that you're able to hold a piece in your hand. If not, add more sugar.
Form balls, about an inch in size (2.5 cm). I like using a cookie scoop so they're all the same size.
Place the balls on the prepared baking sheet and then in the freezer for 30 minutes.
Melt the chocolate and vegetable oil together over a bowl of just simmering water or in the microwave in 30 second increments, stirring well in between each increment.
Use a dipping tool or a fork to dip the balls in the melted chocolate, one at a time. Then place them on parchment lined baking sheet. Add any toppings before the chocolate sets.
Let the chocolate set for at least half an hour.
Enjoy!
Notes
TIPS FOR SUCCESS
Freezing the balls for at least half an hour makes it a lot easier to dip in the melted chocolate. It also helps the chocolate set faster.
If the chocolate thickens after a while, you can easily reheat for a few seconds it in the microwave or over a double boiler.
When you dip the balls in chocolate, try to tap off as much excess chocolate as possible to get a more consistent, uniform look.
Using parchment paper makes it easier to remove the peanut butter balls and avoids a mess in the kitchen.
Let the chocolate set for at least half an hour before storing.