Go Back
peanut butter marshmallow swirl brownies on a wide white plate in a horizontal shot, dark squares marbled with golden peanut butter and white toasted marshmallow ribbons, one bar pulled apart to show gooey swirls, crumbs on a soft-lit counter, natural light, shallow depth of field, landscape orienta

Peanut Butter Marshmallow Swirl Brownies

Decadent brownies mixed with peanut butter and toasted marshmallow fluff.
Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings: 16 bars
Ingredients Method Notes

Ingredients
  

  • 3/4 cup butter melted
  • 1.5 cups sugar
  • 3 eggs
  • 3/4 cup cocoa powder
  • 1 cup flour
  • 1/2 cup peanut butter
  • 1 cup marshmallow fluff
  • 1 tsp vanilla extract

Method
 

  1. Heat oven to 350F and line a square pan with parchment.
  2. Whisk butter, sugar, eggs, vanilla, cocoa, and flour into a batter and spread in the pan.
  3. Dollop the peanut butter and marshmallow fluff over the top.
  4. Swirl them through the batter with a knife.
  5. Bake 28 to 30 minutes until set, then cool before cutting.

Notes

Spray your knife with a little oil so the marshmallow swirls cleanly.