In a mixing bowl, combine peanut butter, powdered sugar, butter, and vanilla extract. Stir until smooth.
Gently fold in Rice Krispies until evenly mixed.
Roll mixture into 1-inch balls and place on a parchment-lined baking sheet.
Refrigerate for 20–30 minutes to firm.
Melt chocolate chips in the microwave in 20-second intervals until smooth.
Dip each ball into melted chocolate, coating fully. Allow excess to drip off.
Place coated balls on parchment paper and let chocolate set.
Store in an airtight container in the fridge.