Reese’s Pieces Peanut Butter Bars

Reese’s Pieces Peanut Butter Bars have so much peanut butter flavor and a thick layer of rich chocolate frosting. Reese’s Pieces candies are sprinkled on top and added to the batter for lots of crunchy candy flavor. If you want a dessert with lots of peanut butter, this is it!

The bars are soft and chewy and buttery with a little crunch from the Reese’s Pieces candies. Reese’s Pieces Peanut Butter Bars are baked in a 9×13-inch pan so they are perfect for a crowd of people. They would be delicious as is, but the rich chocolate frosting really takes them over the top.

No one can resist that winning chocolate and peanut butter combination.

Reese's Pieces Peanut Butter Bars recipe

How To Make Reese’s Pieces Peanut Butter Bars

(More detailed description and video in recipe card below.)

In a saucepan, melt the butter and brown sugar.
Stir in the peanut butter and let cool.
Whisk together the flour, baking powder, baking soda, and salt.
Whisk the eggs and vanilla into the peanut butter mixture.
Stir peanut butter mixture into dry ingredients.
Stir in Reese’s Pieces and transfer batter to greased baking dish. Bake for 25 to 30 minutes.
Make the frosting. Boil butter, milk, and sugar for 30 seconds. Remove from heat and stir in chocolate chips and vanilla. Pour over bars. Sprinkle with Reese’s Pieces.
Let bars cool completely and then cut into squares.

Type Of Peanut Butter To Use

When baking, I find it is best to use traditional peanut butter that does not need to be stirred like Jif or Skippy.

Recipe Tip

Be sure to measure the flour correctly or your bars may be dried. First fluff the flour up some in the bag or container. It tends to get packed down over time. Then gently scoop it with a large spoon into a dry measuring cup. Overfill it slightly and then run the back of a knife across the top to get rid of excess.

Reese's Pieces Peanut Butter Bars with chocolate frosting

Storage

Can be stored in an airtight container at room temperature for 4 days or frozen for up to 3 months.

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More Chocolate and Peanut Butter Desserts

Reese’s Pieces Peanut Butter Bars

Course Dessert

Prep Time 20

Cook Time 30

Total Time 50

Servings servings

Calories 678kcal

Equipment

9×13-inch baking dish

Ingredients

¾ cup butter
3 cups packed light brown sugar
¾ cup creamy peanut butter
3 large eggs
1 ½ teaspoons vanilla extract
3 ¾ cups all-purpose flour
1 ½ teaspoons baking powder
½ teaspoon baking soda
¾ teaspoon salt
1 cup Reese’s Pieces candies

Frosting

6 tablespoons butter, cut into pieces
6 tablespoons milk
1 ½ cups granulated sugar
1 cup semi-sweet chocolate chips
¼ teaspoon vanilla extract
¼ cup Reese’s Pieces

Instructions

Preheat oven to 350 degrees and grease a 9×13-inch baking pan.
In a saucepan over medium heat, melt butter and brown sugar. Stir until smooth.
Take saucepan off heat, stir in peanut butter until smooth. Let cool.
In a large bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
Once peanut butter mixture has cooled, whisk in eggs one at a time. Stir in vanilla.
Add peanut butter mixture to dry ingredients, and stir until blended.
Stir in Reese's Pieces and transfer batter to prepared pan, spreading it evenly. Bake for 25 to 30 minutes or until set in middle and golden brown around edges.
Make frosting. Combine butter, milk, and sugar in a saucepan and bring to a boil. Cook at a rolling boil for 30 seconds.
Remove from heat and stir in chocolate chips and vanilla until smooth. Pour over warm bars.
Sprinkle Reese's Pieces on top. Let cool completely before cutting into squares.