- 4 oz (1 stick) butter
- 528 g (2 cups) peanut butter
- 100 g (1/2 cup) brown sugar (91g sugar + 9g molasses)
- 300 g (2.5 cups) powdered sugar
- 1 tsp vanilla extract
- 448 g (2 cups) semisweet chocolate chips
- Place butter and peanut butter in a large microwavable bowl.
- Heat 1-2 minutes, or until butter is mostly melted, then stir to combine.
- Add both sugars and vanilla extract; mix until thoroughly combined.
- Pat into a 9 x 13 pan.
- Melt chocolate chips in microwave, stirring between 30-second intervals.
- Spread melted chocolate thinly over peanut butter mixture.
- Allow to cool completely at room temperature until chocolate hardens, or refrigerate for faster hardening.