Peanut Butter Sheet Cake with Peanut Butter Frosting

This Peanut Butter Sheet Cake is a dream for peanut butter lovers! A moist, fluffy cake infused with rich peanut butter flavor is topped with a smooth, creamy peanut butter frosting. Easy to make with simple ingredients, this cake is perfect for birthdays, potlucks, or just because you deserve a treat!

Why This Recipe Works

✔ Rich & Moist – The combination of butter, eggs, and peanut butter keeps the cake soft and tender.

✔ Peanut Butter Perfection – Both the cake and frosting are loaded with nutty, creamy goodness.

✔ Simple Ingredients – Starts with a yellow cake mix for easy preparation.

✔ Crowd-Pleaser – The 9×13-inch sheet cake makes it great for sharing!

What You’ll Need for This Recipe

Ingredients for the Cake:

1 box yellow cake mix

4 eggs

½ cup butter, softened

1 cup water

½ cup creamy peanut butter

Ingredients for the Frosting:

3 cups confectioners’ sugar

½ cup creamy peanut butter

½ cup butter, softened

2+ tablespoons milk (adjust as needed)

1 teaspoon vanilla extract

How to Make Peanut Butter Sheet Cake

Step 1: Preheat the Oven

Preheat your oven to 325°F (165°C).

Lightly grease a 9×13-inch baking pan and set aside.

Step 2: Prepare the Cake Batter

In a large mixing bowl, cream together softened butter and peanut butter until smooth.

Add the eggs, cake mix, and water. Beat on medium speed for about 2 minutes until the batter is smooth.

Pour the batter into the prepared pan, spreading it evenly.

Step 3: Bake the Cake

Bake for 40 minutes, or until a toothpick inserted in the center comes out clean.

Let the cake cool completely before frosting.

How to Make the Peanut Butter Frosting

Step 4: Prepare the Frosting

In a mixing bowl, cream together softened butter and peanut butter until smooth.

Gradually add confectioners’ sugar and mix until well combined.

Add vanilla extract and 2 tablespoons of milk. Mix until light and fluffy.

If the frosting is too thick, add more milk, one tablespoon at a time until you reach the desired consistency.

Step 5: Frost the Cake

Once the cake is completely cool, spread the frosting evenly over the top.

Slice, serve, and enjoy every peanut buttery bite!

Tips + Tricks for Recipe Success

✔ Use Room Temperature Ingredients – This ensures a smooth batter and fluffy frosting.
✔ Don’t Overbake – Check at 35 minutes to avoid a dry cake.
✔ For Extra Flavor – Add ½ cup chopped peanuts to the frosting for a crunchy twist!
✔ Make it a Layer Cake – Bake in two 9-inch round pans and stack for an impressive dessert.

Serving Suggestions

This cake is delicious on its own, but you can also:

Drizzle with melted chocolate for a Reese’s-style treat.

Top with crushed peanut butter cups for extra indulgence.

Serve with a glass of cold milk or coffee.

Timing Information

Prep Time: 10 minutes

Cook Time: 40 minutes

Cooling & Frosting: 30 minutes

Total Time: 1 hour 20 minutes

Final Thoughts

This Peanut Butter Sheet Cake is an irresistible, rich, and creamy dessert that’s perfect for any occasion. The moist peanut butter cake combined with the smooth peanut butter frosting makes it a true peanut butter lover’s dream!

Try it out and let me know what you think! Happy Baking!

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