This Peanut Butter Sheet Cake is easy to make and disappears quickly at potlucks! This is a dessert recipe that you’ll need to keep on-hand to pass out copies for!
Peanut butter sheet cake makes its appearance far too often in this house!
I stumbled upon this recipe for peanut butter sheet cake, probably about 4 or 5 years ago. Since then, I have made it for at least one of my kids’ birthdays each year. Sometimes for both of them. We take it to picnics all summer long and sometimes we just hoard it at our house, because we can’t bear to part with it.
In fact, today happens to be my son’s 16th birthday (how in the actual heck did this happen??), so it’s giving me a little motherly smile that I’m actually publishing this post today.
It is by far his most requested dessert for years now! In fact, when I used to own a bakery, I started making this just because he kept requesting it. He would look so proud when he would see it in our display case! Like it was his personal invention or something.
But, honestly, I don’t blame him one bit. For most of my life, I thought a Texas Sheet cake was the ultimate cake. It was such a treat when my mom would make it. This peanut butter sheet cake ranks right up there with it.
The cake is so fluffy and moist with just the right amount of peanut butter flavoring. The frosting is the real show stopper on this cake, though.
It’s a cooked icing that you make on the stove top, and then you pour it over the cake while it’s still warm from the oven. You don’t need to be able to frost a cake or worry about anything like that.
The frosting will even itself out with just a couple swooshes from your knife. And since cakes rise in the center, gravity works to push the frosting out to the lower edges of the cake. The frosting seeps down into the little crack between the cake and the sides of the pan, and it is just SO.GOOD.
This is definitely a dessert where you want to go for the edges. You get soooo much more peanut butter frosting!
Just be sure to sift your powdered sugar before you add it to the cooked peanut butter. If you don’t, you’ll end up with little clumps in your frosting. It does not affect the taste AT ALL. If this happens, do not panic… just keep devouring at a normal pace.
But in terms of looks, it’s worth it to take a little extra time to sift out those powdered sugar clumps. I just use a basic sifter like this one and it takes no time at all!
Peanut Butter Sheet Cake
A rich and moist peanut butter sheet cake that is just as delicious as the standard Texas Sheet Cake!
- 1/4 cup Peanut Butter
- 1 cup Water
- 1/2 cup Butter
- 1 cup Sugar
- 1 cup Brown Sugar
- 2 cups Flour
- 1 tsp Salt
- 1 tsp Baking Soda
- 2 Eggs
- 1 tsp Vanilla
- 1/2 cup Buttermilk
- 3/4 cup Butter
- 6 tbsp. Buttermilk
- 1/2 cup Peanut Butter
- 3 1/2 cups Powdered Sugar (sifted)
- 1 tbsp. Vanilla
For the Cake:
Preheat oven to 375. Grease a large cookie sheet with sides (12×17 jellyroll sheet will work well).
In a saucepan, add peanut butter, water and butter and bring to a boil. Remove from heat.
In a separate bowl, mix sugar, brown sugar, flour, baking soda and salt. Stir well. Add to peanut butter mixture and stir until completely combined.
Add the eggs, vanilla and buttermilk. Mix well and pour into greased cookie sheet. Bake for 15 minutes until center springs back when touched.
While cake is cooking, in a small saucepan, bring butter, buttermilk and peanut butter to a boil. Remove from heat and add powdered sugar and vanilla. Whisk until completely combined.
When cake is removed from the oven, let sit for 3-5 minutes. Then pour frosting over still warm cake.