White Chocolate Peanut Butter Bars

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White Chocolate Peanut Butter Bars  are deliciously peanut butter cake bars topped with a dreamy white chocolate buttercream and Reese’s mini white chocolate peanut butter cups.  A PB lover inspired recipe you’ll love! 

You may love this Decadent Peanut Butter Chocolate Pie – Costco CopyCat Recipe and these 30 Peanut Butter & Candy Desserts! We love peanut butter and chocolate!

This yummy, ultra moist peanut butter sheet cake is baked in a 9×13 pan.  Then we pair it with a creamy, luscious white chocolate buttercream frosting that is to die for!

The top of the cake we have heavenly Reese’s white chocolate peanut butter cups.  You get some of everything in each bite!  A little sweet, a little salty…OMG!

chocolate peanut butter bars

Talk about yummy!!

White Chocolate Peanut Butter Bars are the talk of town!  Well, at least in my kitchen and hopefully yours too, soon!

chocolate peanut butter bars

These kind of treats are wonderful when you want to feed a small army for any occasion.

This dessert was inspired for the upcoming Fall season, Halloween party fun, football game night and of course, for peanut butter lovers–always wanting even more peanut butter recipes in their life! (like me!)

chocolate peanut butter bars

Speaking of peanut butter treats, don’t overlook these amazing Home-made Chocolate Peanut Butter Cup Footballs, these OMG Peanut Butter Cup BrowniesDouble Stuffed Peanut Butter Cup Bliss Cupcakes, and these ‘Awesome’ Peanut Butter Buckeye Rice Krispies too!

chocolate peanut butter bars

Other White Chocolate Peanut Butter Bars options: 

I love these as they are, but I love other options too!

  • If you want even more of the salty side with the sweet, you could add pretzel bits or salted peanuts to the top.
  • If you want more a more color pop for Fall, add some Reese’s Pieces.  How cute right?
  • Of course, if you’re strictly a peanut butter fan, try this peanut butter frosting here for a peanut butter and chocolate lover, try this chocolate frosting with the peanut butter cake.

chocolate peanut butter bars

Let’s Dive IN!!!

More Peanut Butter Bar Heaven!

You may want to snag the recipe of our amazing Amish Peanut Butter Cream Pie as well!  It’s a winner!

White Chocolate Peanut Butter Bars

White Chocolate Peanut Butter Bars

Kim Lange
White Chocolate Peanut Butter Bars - Deliciously peanut butter cake bars topped with a dreamy white chocolate buttercream and Reese's mini white chocolate peanut butter cups. PB lover inspired! 
4.34 from 15 votes
Course Dessert


Peanut Butter Sheet Cake:

  • 1 cup all-purpose flour
  • 1 cup sugar
  • teaspoon salt
  • ½ teaspoon baking powder
  • ½ cup butter
  • ½ cup water
  • 3 tablespoons creamy peanut butter
  • 1 egg beaten
  • 1 teaspoon vanilla extract
  • ¼ cup buttermilk, or any milk will work

White Chocolate Buttercream Frosting:

  • 1 cup unsalted butter softened softened
  • 12 ounces white chocolate melted and cooled slightly
  • 1 cup confectioners' sugar
  • 1 teaspoon pure vanilla extract
  • ¼ teaspoon salt
  • 1 package of Reese's Mini White Chocolate Peanut Butter Cups roughly chopped


White Chocolate Peanut Butter Bars:

  • Preheat oven to 350 degrees.
  • Sift together flour, sugar, salt and baking powder in a large bowl, then set aside.
  • Combine butter, water and peanut butter in a saucepan over medium heat and bring to a boil.  Add in the flour mixture and whisk together, then set aside.
  • Combine egg, vanilla and buttermilk and whisk together, then transfer to peanut butter mixture and mix well until everything is just incorporated.
  • Spread into a greased 9x13 pan. This cake will rise so when you put in it pan, it will appear as a thin layer.
  • Bake for 12-17 minutes, until it springs back when gently touched.

White Chocolate Buttercream:

  • Using a mixer, beat the butter at medium speed until creamy. Beat in the melted white chocolate. Add in the confectioners' sugar, salt and vanilla and beat at low speed until light and fluffy.
  • Add more confectioners sugar for a more stiff frosting, but add it 1/4 cup at a time.
  • Sprinkle the chopped peanut butter cups on top. 
    Cut and serve!


Double the recipe for a 11X17 inch sheet/jellyroll pan for a crowd!  Cut the recipe in half for 8x8 pan.  
Keyword bars, cake, peanut butter, white chocolate
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  1. I’m definitely a peanut butter and chocolate lover! I usually pair my PB with dark chocolate, but the pairing with white chocolate in these bars looks and sounds amazing! Definitely a treat perfect for fall celebrations!

  2. It’s like you’re reading my mind! I’ve been dreaming of a dessert with white chocolate and peanut butter! This is a cake I’m def going to make! Thanks for the idea, and I’m all in for adding pretzels for a sweet-salty vibe!

  3. Yep – I fall into the category of, “peanut butter lover – always wanting even more peanut butter recipes in my life!” This is a winner – and you’re right – just perfect for fall!

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