★★★★★

Peanut Butter Sheet Cake

This Peanut Butter Sheet Cake is an unbelievably moist, rich, peanut butter cake with creamy peanut butter frosting poured on top. Similar to Texas Sheet Cake, but for the peanut butter lover instead!

Love Peanut Butter? Be sure to try our thick and fudgy Peanut Butter Brownies. Swirls of peanut butter in the batter. Speaking of swirls, our Peanut Butter Chocolate Chip Cookie Bars have swirls AND puddles of peanut butter. What’s not to love?

Peanut butter sheet cake square on a spatula for serving.

Peanut Butter Texas Sheet Cake

Almost everyone’s had Texas Sheet Cake before, right? I first tried Chocolate Buttermilk Sheet Cake when I was a kid and fell in love with the fudgy texture covered with melty frosting.

We’re serious peanut butter lovers at this house, so I decided I needed to figure out a version of sheet cake that would deliver that swoon-worthy fudgy moist texture along with serious peanut flavor.

We love our easy Peanut Butter Cake around here but I was in the mood for something more like a traditional Texas Sheet Cake but with peanut butter.

Never be satisfied with just some peanut butter when you could have all the peanut butter. I also put creamy peanut butter into the soft frosting that goes on top of this cake.

My family went nuts over Texas Sheet Cake with Peanut Butter (forgive the pun) and I can’t wait for you to try it.

Ingredient Notes

Ingredients needed for peanut butter sheet cake.

Sheet Cakes are so easy to make and decorate. If icing with buttercream isn’t your strong suit, you’ll love how fuss free it is to decorate this peanut butter cake.

To make sheet cake, you don’t use a usual cake pan. Instead, you need a sheet pan style cookie sheet. I used a 12×18 inch style baking sheet to make Peanut Butter Sheet Cake.

  • Peanut Butter– choose a shelf stable peanut butter like Jif or Skippy for best results!
  • Vanilla Extract– use pure vanilla, not imitation!
  • All-Purpose Flour- we tried using cake flour on this sheet cake, but it resulted in a too delicate cake. The all-purpose flour held up to the delicious peanut butter frosting.
  • Buttermilk– if you don’t have any on hand, use my easy buttermilk substitute!

Easy Instructions

Step by step photos showing how to make peanut butter cake.

Prep. Preheat oven and line the bottom of a baking sheet with parchment paper.

Cake Batter. Make the cake batter in a saucepan by adding peanut butter, water, and butter. Boil then remove from heat. Add ingredients, pour into pan, and bake.

Peanut Butter Frosting. Add to the cake whle the cake is still warm. It will soak into the cake creating a “gooey” texture on top similar to a texas sheet cake.

No messing with frosting bags or piping! Sheet cake looks as good as it tastes with no fancy cake decorating skills required.

Peanut butter frosting being poured over warm peanut butter sheet cake.

Recipe FAQs

How do you store sheet cakes?

This peanut butter sheet cake can be stored at room temperature for up to 4 days. Keep it in an airtight container or covered in plastic wrap for best taste.

Can you freeze sheet cake?

Sheet cakes are great for feeding a large family or crowd, but can also leave a small group with lots of leftovers. Fortunately, they freeze well. Store sheet cake in an airtight container in the freezer for up to 3 months.

What kind of peanut butter is best for cake?

Choose a shelf stable peanut butter, like Jif or Skippy for using in this peanut butter cake recipe. It has the perfect texture and sweetness needed.

Peanut butter sheet cake sliced into squares on a baking sheet.

Tips and Tricks

  • Don’t have buttermilk handy? You can make a buttermilk substitute to use in this recipe.
  • Unsalted butter is my preference here (and for most cakes and frostings). If you only have salted butter that will work, too, just reduce the amount of salt called for in the recipe.
  • Too much peanut butter? Use my favorite chocolate buttercream instead!
  • Love sheet cakes? Try our delicious Watergate Sheet Cake next! Or give this delicious vanilla sheet cake recipe a try soon.
Slice of peanut butter cake on white plate with remaining cake in background.

More Easy Cake Recipes

PS. If you try this recipe, please leave a STAR rating in the recipe card below. I love your feedback! Connect with me on social media by following me on Instagram, Facebook, or Pinterest.

Yield: 20 servings

Peanut Butter Sheet Cake

Prep Time 15 minutes
Cook Time 15 minutes
Additional Time 15 minutes
Total Time 45 minutes

This Peanut Butter Sheet Cake is an unbelievably moist, rich, peanut butter cake with creamy peanut butter frosting poured on top. Similar to Texas Sheet Cake, but for the peanut butter lover instead!

Ingredients

For the cake

  • ¼ cup peanut butter
  • 1 cup water
  • ½ cup unsalted butter
  • 1 cup granulated sugar
  • 1 cup light brown sugar, packed
  • 2 cups all-purpose flour
  • 1 tsp kosher salt
  • 1 tsp baking soda
  • 2 large eggs
  • ½ cup buttermilk
  • 1 tsp vanilla extract

For the frosting

  • ¾ cup unsalted butter
  • 6 Tbsp buttermilk
  • ½ cup peanut butter
  • 3 ½ cups powdered sugar
  • 1 Tbsp vanilla extract

Instructions

  1. Preheat oven to 375 degrees F. Line a cookie sheet 12x18-inch (sheet pan size) with parchment paper. Set aside.
  2. In a LARGE saucepan, combine peanut butter, water, and butter for the cake. Bring to a boil, while stirring constantly. Once boiling, remove from heat. Add in sugars, flour, salt and baking soda. Mix until well combined. Add in eggs, buttermilk, and vanilla until blended. Pour into prepared baking sheet and bake for 15 minutes.
  3. While the cake is baking, prepare the frosting. In a saucepan, combine butter, buttermilk, and peanut butter. Bring to a boil, while stirring.
  4. Remove from heat and add in powdered sugar and vanilla extract. Whisk until smooth. Pour over warm cake.

Notes

  • Don't have buttermilk handy? You can make a buttermilk substitute to use in this recipe.
  • Unsalted butter is my preference here (and for most cakes and frostings). If you only have salted butter that will work, too, just reduce the amount of salt called for in the recipe.
  • Too much peanut butter? Use my favorite chocolate buttercream instead!
  • Love sheet cakes? Try our delicious Watergate Sheet Cake next!
  • Storage: Store at room temperature in airtight container or covered with plastic wrap for up to four days. Freeze for up to 3 months.

Recommended Products

As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases.

Nutrition Information:

Yield:

20

Serving Size:

1 slice

Amount Per Serving: Calories: 366Total Fat: 17gSaturated Fat: 8gTrans Fat: 0gUnsaturated Fat: 7gCholesterol: 50mgSodium: 258mgCarbohydrates: 51gFiber: 1gSugar: 39gProtein: 5g

*Nutrition facts are an estimate and not guaranteed to be accurate. Please see a registered dietitian for special diet advice.

Did you make this recipe?

Please leave a comment on the blog or share a photo on Instagram

Make this cake this weekend for the peanut butter fans in your life and they’re guaranteed to love you forever. Can’t decide between chocolate sheet cake or peanut butter? Why not make them both!

About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

Get My Free Email Course
Become a Better Baker—no more box mixes! Discovery your new “signature” desserts!

Categories:


Posted on February 10, 2021

Comments & Reviews

  1. I just made this cake. It is delicious and tender. The crumb is perfect. Just the right amount of peanut butter flavor. I sprinkled just a tiny bit of salt on top (the only change I made un the recipe) and it is jusy lovely. I ate it warm, but it’ll make a great breakfast in the morning.😂

  2. Thank you for sharing this peanut butter sheet cake recipe, tried it, loved it. If there is a rating of 10 for
    this recipe, you nailed it!

Leave a Reply

Your email address will not be published. Required fields are marked *