Peanut butter marshmallow squares are a classic treat that comes together in minutes! You only need four ingredients to make these nostalgic no-bake bars!
Place the bag of mini marshmallows into the freezer while you prep everything else (15-20 minutes).
Line a 9x13 baking pan with parchment paper.
In a saucepan, combine butter, butterscotch chips, and peanut butter. Heat on medium-low, stirring, until smooth and creamy and the butter is melted. Do NOT bring to a boil.
Pour the cold marshmallows into a large bowl. Pour peanut butter/butterscotch mixture over.
Stir until completely coated.
Pour into prepared baking pan and pat with a rubber spatula to evenly distribute.
Chill in the refrigerator for 1-2 hours.
Cut into 24 squares.
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Notes
CHOCOLATE DIPPED PEANUT BUTTER SQUARESTo take them up a notch, dip the squares in melted chocolate chips or Ghirardelli chocolate melts. Let excess drip off (I find that dragging it across the edge of the bowl helps), then place on a parchment-lined baking sheet to set.HOW TO STORE BARSYou can store the bars at room temperature, in the refrigerator, or in the freezer. We like them chilled, but they are delicious no matter how you store them. If stored in an airtight container, they will stay fresh for up to 7 days.