Chocolate Sheet Cake with Peanut Butter Frosting


Chocolate Sheet Cake with Peanut Butter Frosting from Our Best BitesSo my oldest turned 9 last week.

It was rough.

Some of his birthdays are fun, some of them are exciting, some of them kind of come and go. And some of them kind of wring my heart a little. See, it seems like yesterday that we did this…


Big smiles copy


and this…

8 years ago

and now we’re doing this…

9th birthday


and, in the same amount of time that he’s been alive, he’s going to be getting ready to move away from home. And it kind of kills me a little.

So I’m not going to think about that, and instead, I’m going to eat my feelings in the form of the Jones Family Birthday Cake (who am I kidding, all those feelings got eaten about 4 days ago. Now I’m cakeless and sad all over again).

I got the Hershey’s Best-Loved Recipeswhich I’m pretty sure is out of print but not impossible to find, right after my husband and I got married almost 13 years ago. And when I put it on its spine, this is where it opens up:

cookbook page

It’s clearly gotten a lot of love. Everyone in our whole family loves this cake, and it’s super easy, so, by default, it’s kind of become the family birthday cake.

You’re going to need butter, unsweetened cocoa, sugar, flour, baking soda, salt, eggs, and buttermilk or sour cream.

peanut butter chocolate cake ingredients

Preheat oven to 350. Grease a 9×13″ pan (and flour it if you like to; I usually don’t) and set it aside.

In a medium saucepan, combine the water, butter, and cocoa powder.

butter, water, cocoa powder for sheet cake

Over medium heat, stir the mixture frequently until it comes to a boil. Boil for 1 minute, then remove from heat.

In a large bowl (or the bowl of your stand mixer), add the flour,

flour for chocolate sheet cake


sugar for chocolate sheet cakebaking soda, and salt

salt and baking soda

and whisk together to combine.

whisked together dry ingredients

Add the eggs, vanilla, and buttermilk (or sour cream)

wet ingredients for chocolate sheet cake

and beat until blended. Add the cocoa mixture and beat until just combined. Pour into the prepared pan.

Bake for 25-30 minutes or until a pick inserted into the center comes out clean. Allow to cool completely.

To prepare the frosting, combine the peanut butter chips, milk, and butter in a medium saucepan

peanut butter frosting ingredients

and heat, stirring frequently, over medium heat until the chips are melted and the the mixture is combined. Remove from heat, then whisk in the vanilla extract and the powdered sugar until smooth (you can use an electric mixer if you’d like). Pour the frosting over the cake and smooth with a spatula, then, if desired, sprinkle with mini Reese’s Pieces.

peanut butter chocolate sheet cake

Allow to cool before serving.

peanut butter chocolate sheet cake

Or sticking candles in it and getting all teary in the dark while your baby blows out his birthday candles. Yes, I’m a mess.

blowing out birthday candles

Makes 12 servings.

Chocolate Sheet Cake with Peanut Butter Frosting from Our Best Bites


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  1. Awww, Kate, I feel for you! My daughter turned 12 (TWELVE!!!) last October and I am still in shock! Your boy is so handsome, happy birthday to him!!

  2. What a handsome boy! I’m not usually tempted by choco/peanut butter, but the hubby’s birthday is next week and he LOVES this! So many fun years right around the corner!

  3. Hi Kate, my daughter will turn 9 this year as well and I know how you are feeling. She is my oldest as well!! She tells me she won’t leave or that she will buy the house next door…so sweet, but that will never happen! Your son is a handsome boy! I know what we are making for dessert next weekend!! This looks fabulous and my family loves anything peanut butter! Thanks for sharing!

  4. I cannot believe a post about a chocolate peanut butter cake has me in tears. Okay, I can, because my babies (boy/girl twins) just turned 9 on the 3rd. I share your feelings EXACTLY.

    Oh, the cake looks awesome BTW.

  5. My son is turning 2 soon, which makes me sad so I can’t even imagine how 9 feels! He LOVES peanut butter, so maybe this should be his birthday cake. I’d like to make an 8-in cake with 2 layeres. How would you recommend doing that with this recipe?

  6. I have this same recipe book and have made this recipe more times then I can count! It’s amazing! Happy belated birthday to your son!

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