Peanut Butter Rice Krispies® Brownies


A soft fudge brownie layered with peanut butter and topped with a Rice Krispies® treat. Serve cooled or at room temperature. Great for parties!

Prep Time:
15 mins
Cook Time:
35 mins
Additional Time:
30 mins
Total Time:
1 hrs 20 mins
16 brownies


  • 1 (18 ounce) package fudge brownie mix

  • ½ cup vegetable oil

  • ¼ cup water

  • 2 eggs

  • cup flour

  • ¼ teaspoon baking powder

  • teaspoon salt

  • ½ cup crunchy peanut butter

  • cup brown sugar

  • 2 tablespoons butter, softened

  • 1 egg

  • ½ teaspoon vanilla extract

  • ¼ cup butter

  • 4 cups miniature marshmallows

  • 3 ½ cups crispy rice cereal (such as Rice Krispies®)


  1. Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.

  2. Beat brownie mix, vegetable oil, water, and 2 eggs in a bowl until batter is smooth.

  3. Whisk flour, baking powder, and salt together in a small bowl.

  4. Beat peanut butter, brown sugar, and 2 tablespoons butter together in another bowl with an electric mixer until light and creamy. Beat 1 egg and vanilla into peanut butter mixture until fluffy. Stir flour mixture into peanut butter mixture until just blended.

  5. Pour brownie batter in the prepared baking dish. Drop peanut butter mixture by small spoonfuls over the brownie batter.

  6. Bake brownies in the preheated oven until a toothpick inserted in the center of the brownies comes out clean, about 30 minutes; cool.

  7. Melt 1/4 cup butter in a large saucepan over medium heat; add marshmallows and stir until marshmallows are melted. Cook mixture until butter and marshmallow flavors are combined, about 2 minutes; remove from heat.

  8. Spread 1/3 the marshmallow mixture over the cooled brownies. Stir crispy rice cereal into remaining 2/3 the marshmallow mixture; press in an even layer on top of the brownies. Refrigerate until set, about 15 minutes; cut into squares.

Cook's Note:

You can 'marble' the brownies by running a knife through the spoonfuls of peanut butter mixture into the brownie batter.

Nutrition Facts (per serving)

384 Calories
20g Fat
49g Carbs
6g Protein
Nutrition Facts
Servings Per Recipe 16
Calories 384
% Daily Value *
Total Fat 20g 25%
Saturated Fat 6g 28%
Cholesterol 47mg 16%
Sodium 291mg 13%
Total Carbohydrate 49g 18%
Dietary Fiber 2g 6%
Total Sugars 29g
Protein 6g
Vitamin C 4mg 20%
Calcium 20mg 2%
Iron 4mg 21%
Potassium 91mg 2%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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