01 -
Line a 9-inch square pan with parchment paper and spray lightly with oil.
02 -
In a saucepan, combine butterscotch chips, peanut butter, and butter. Heat over medium-low, stirring constantly until chips have melted and mixture is smooth.
03 -
Add salt and vanilla extract to the mixture and stir to combine.
04 -
Set aside 1 cup of marshmallows. Add remaining marshmallows to the butterscotch mixture and fold to combine. Ensure mixture is cool enough not to melt marshmallows but warm enough to stir easily.
05 -
Press mixture firmly into prepared baking dish. Cover top with reserved marshmallows, gently patting down to ensure they stick.
06 -
Refrigerate for at least 1 hour or until solid. Cut into squares before serving.