These soft, chewy brownie-like bars come together quickly—starting with a box cake mix and a jar of marshmallow crème. The original recipe came from Cooking from the Heart of Hospice, Brookings Hospital Hospice (Brookings, SD),submitted by Dianne Becker.
Recipe by Staci at Random Sweets on November 12, 2025
Prep time: PT15M
Cook time: PT20M
Total time: PT35M
Keywords
chocolate and peanut butter, marshmallow creme
Ingredients
15.25 oz Devil's food chocolate cake mix
½ cup unsalted butter (1 stick), melted
⅓ cup milk or evaporated milk
1 cup creamy peanut butter
7 oz marshmallow crème or fluff
Categories
Dessert
Cuisine
American
Steps
Heat oven to 350℉. Lightly grease 9x13 cake pan.
In a large bowl, stir together cake mix, melted butter, and milk.
In another bowl, stir together the peanut butter and marshmallow crème. It helps to slightly warm the marshmallow crème in the microwave.
Put ¾ of the chocolate mixture in the bottom of the cake pan. Spread it out and press down to cover bottom of pan. Spread the peanut butter mixture over the chocolate. Cover with remaining chocolate batter to create a marbled look. Press it down so it sticks in the peanut butter.
Bake at 350℉ for 20-25 minutes. The edges should be just lightly browned. Cool. Store covered at room temperature.
