Peanut Butter Brownie Cake

By George, I think she’s got it! After 6 days, my sweet little baby girl has successfully been potty trained! The first 3 days were difficult to say the least, but after that, things just sort of clicked and she kept having less accidents! I am one proud mama!

So, in honor of my potty-conquering 2 year old, I made a fabulous cake to celebrate! That’s right….another dessert. I post them because I can. And, I quite possibly may be addicted to sugar. Are you getting sick of desserts yet? Should I actually post meals that have some sort of nutritional value? Umm…..I’ll think about it. Ha!

Anyways, everyone in this household love peanut butter and chocolate together. Nothing seems to beat it. It always fills our cravings whether it be a peanut butter cup, peanut butter M&M’s or chocolate chips and peanut butter on a spoon {when we’re really in a pinch}. Are you all addicted to PB & chocolate as much as we are? I wouldn’t blame you if you were! 🙂

I’m pretty sure this could fall under the life changing category. It’s fudgy and soft from the brownie and then creamy and smooth with the peanut butter mousse on top. Yup. Peanut butter mousse. And then, if that wasn’t enough, I top the whole thing with chocolate sauce and salted peanuts. Ridiculous, right? Am I losing my mind with all these sweets? OH WELL!

Hope you guys like this recipe! We sure did! 🙂

Peanut Butter Brownie Cake
yield: 12-16 servings
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1 box brownie mix
eggs, oil, water
3/4 cup heavy cream
1/2 teaspoon vanilla
1/2 tablespoon cornstarch
12 oz. cream cheese, softened
3/4 cup smooth peanut butter
2 cups powdered sugar
1 teaspoon vanilla

chocolate sauce
salted peanuts

Preheat oven to 350 degrees or temperature on back of brownie box. Lightly grease a 9 or 10-inch spring form pan and set aside.

In large bowl, mix brownie batter according to package directions. Pour into prepared pan and bake 30-40 minutes or until set. {Look on the back of the box for the time it takes to bake a 9×9 square pan of brownies-that’s a good time to start off with and then go from there.} Remove brownies from oven and cool completely.

In a stand mixer, whip heavy cream with vanilla and cornstarch until firm peaks form. Scrape whipped cream into smaller bowl and set aside. In the same stand mixer bowl {no need to wash!}, whip cream cheese and peanut butter together until combined. Stir in powdered sugar and vanilla. Scrape sides and whip again for 1 minute. Carefully fold in whipped cream. Scoop peanut butter mixture onto cooked brownie and smooth the top. Refrigerate until set, at least 2 hours.

When you are ready to serve, remove sides of spring form pan. Cut into pieces and drizzle with chocolate sauce and salted peanuts.


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  1. Mmmmm, this looks just perfect! Lovely photos too Lauren 🙂

  2. Oh yum! I’m definitely making this!
    By the way, I’m a bit confused, why would you stop stop desserts and start making food with nutritional value? My brain doesn’t compute – all it knows is sugar = good, no sugar = bad!

  3. This look so easy and so delicious! My husband loves peanut butter anything so I’ll have to try this one.

  4. Yeah, this was pretty darn heavenly…..

  5. This is absolutely amazing, Lauren. I am bookmarking this to make for my friend’s birthday – she’s a huge fan of chocolate and pb.

  6. What a great looking cake! Love the picture. Congrats on the potty training.

  7. This cake looks so tasty. I’m also obsessed with the peanut butter chocolate combination. Yum!

  8. Um, yes please!!! This looks like a mad combination of that brownie cookie thing and that ridiculous PB pie. Both of them smooshed together!! Brilliant.

  9. I just saved this in my Tasty Kitchen Recipe Box!

    It looks sooooo good! 🙂

  10. my favorite way to eat chocolate is with peanut butter 🙂 this looks so decadent and delicious!!

    congrats to your 2 year old! that is an accomplishment! (for both of you!)

  11. My husband favorite candy is peanut butter cups. His birthday is tomorrow so guess what we will be having!! I saw this a while ago and now have a great reason to make it. I’m drooling just thinking about it! Hope I can get it to turn out. Thanks Lauren.

  12. Phew! Good to know I am not the only one that eats chocolate chips on a spoon of peanut butter! 🙂

    My son shares my loves pb and chocolate and his birthday is in two weeks, so this looks like a great birthday cake!! Can’t wait to try it!

  13. My 10 year old and I made this last night for her 4H baking contest and she won first place! Thank you for the awesome recipe that will for sure be made again at our house!

  14. Disappointed it starts with a boxed mix… Any difference if I choose to make a homemade brownie?

  15. Any way to substitute for the heavy cream?

  16. This is officially my next Birthday treat! Every year I make something decadent for my birthday, this certainly fits the bill!