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Buttermilk Brownies with Peanut Butter Frosting Recipe

These classic Buttermilk Brownies are rich and fudgy and topped with a creamy peanut butter frosting (my favorite combination!). This recipe is perfect for a party because it makes an entire sheet pan of brownies.
Serving24
Prep Time 15 minutes
Cook Time 18 minutes
Total Time 33 minutes

Ingredients

  • 2 cups flour
  • 2 cups sugar
  • ½ cup butter
  • ½ cup shortening
  • 1 cup water
  • ¼ cup cocoa
  • ½ cup buttermilk
  • 2 eggs
  • 1 teaspoon baking soda
  • 1 teaspoon vanilla

Frosting

  • 8 ounces cream cheese, 1 package, softened
  • ½ cup unsalted butter, softened
  • 4 cups powdered sugar
  • ⅔ cup creamy peanut butter

Topping

  • 1 cup chocolate chips, melted
  • ½ cup Reese's pieces

Equipment

Instructions

  • In a large mixing bowl, combine the flour and the sugar. Set aside.
  • In a medium saucepan, combine butter, shortening, water, and cocoa. Stir and heat to boiling.
  • Pour boiling mixture over the flour and sugar in the bowl.
  • Add the buttermilk, eggs, baking soda, and vanilla to the mixing bowl. Mix well using a wooden spoon or high speed on an electric mixer.
  • Pour into a well-greased baking sheet (17.5" x 11") pan.
  • Bake at 400 degrees for 15-18 minutes or until brownies test done in center.
  • To make the frosting, mix cream cheese and butter together with a mixer until completely incorporated. Add in powdered sugar and peanut butter and mix well. If it's too thick, thin it out with a little bit of milk. If it's too thin, add some more powdered sugar.
  • Spread frosting on cooled brownies.
  • If desired, drizzle melted chocolate chips over frosting and sprinkle Reese's pieces candies on top.

Notes

  • To make your own buttermilk, simply mix together 1/2 cup milk with 2 teaspoons white vinegar or lemon juice (either one will work). Let the milk sit for at least 5 minutes before adding it into the mixture. That’s it!

Nutrition

Calories: 380 kcal · Carbohydrates: 51 g · Protein: 5 g · Fat: 19 g · Saturated Fat: 8 g · Trans Fat: 1 g · Cholesterol: 40 mg · Sodium: 172 mg · Potassium: 110 mg · Fiber: 1 g · Sugar: 40 g · Vitamin A: 326 IU · Vitamin C: 1 mg · Calcium: 36 mg · Iron: 1 mg
Cuisine: American
Course: Dessert