In a large bowl add the butter and peanut butter and heat in the microwave for 30-second intervals until melted, stirring well between intervals.
Mix in powdered sugar, rice Krispies, and mix until combined.
Using a small cookie scoop or spoon scoop the mixture into a ball and place on a baking sheet lined with parchment paper or a baking mat. Place in freezer for 5 minutes.
Remove balls from the freezer and roll each ball between palms until completely smooth and place back on the baking sheet.
Heat melting chocolate and oil in a small bowl in the microwave in 30 seconds increments until completely melted.
Drop the balls into the melted chocolate and using a fork scoop up the ball and tap the excess chocolate off on the side of the bowl. Place back on the baking sheet, and add chopped peanuts on top
Continue until all bowls are coated. Let set until hardened.
Notes
If using chocolate chips I recommend Ghiradelli, they melt the best. But they will have to be chilled in the refrigerator after covered in chocolate.