Saturday, June 25, 2011

How to: Make a Peanut Butter Rice Krispies Cake

Happy Birthday Mr. Wonderful!  My best friend, husband and most incredible father that I could have ever dreamed of.

About 2 months ago, with birthday plans for Mr. W in mind, I asked what his favorite dessert was.  My thought was that I could turn whatever it was into a fabulous cake.  A little about me and my baking...  I love to bake, it truly is a passion of mine.  But, I really enjoy baking cakes like the Death by Chocolate cake.  7 different layers of chocolate (brownie, cocoa meringue, mousses, chocolate ganache etc) made with the best fancy ingredients that take a full day to make.

Well Mr W is a mid-western man, born and raised in corn country and taught to appreciate the simple things in life.  When it comes to food, I enjoy making the meals that take all day to cook.  Sauces from scratch made from long slow roasted tomatoes.  Mr. W on the other hand is straightforward.  Meat & potatoes, said almost as if they are one word and could not ever be separated.  Vegetables include corn., corn, corn and more corn.  Oh and an occasional carrot.

So, after 15 years of being together I have an epiphany.  Instead of making him a fabulous cake that I would love, how about I make him something he would love.  So was born the idea for a  Rice Krispies Cake.  But, done MY way.  Big, beautiful and delicious!   I decided to kick it up a notch.  Not regular rice krispies but peanut butter.  Not just 1 cake, but 6 layers (3 tiers).  This is what I did...

Peanut Butter Rice Krispies Cake - 2 batches (adapted from Martha Stewart and Culinary in the Desert)
10 tablespoons unsalted butter
3/4 cup crunchy peanut butter
12 cups mini marshmallows
16 cups Rice Krispies (a 13 1/2-ounce box)
2 Recipes - Chocolate Marshmallow Frosting 
1 Recipe - Peanut Butter Frosting
4 Chocolate Bars (I used Willy Wonka's)

Prepare pans by coating with butter.  One recipe makes 2 - 8" pans OR 2 - 6" pans AND 2 - 4" pans.  To make the 6 layer cake make 2 batches.

In a large saucepan over low heat Melt butter and peanut butter. Add marshmallows; stir until melted, about 10 minutes.  Stir in Rice Krispies.  Stir well to coat all cereal with marshmallow mixture.  Before pouring into pan, reserve 1/2 cup for patching cake, and set aside, covered.

Divide mixture evenly into pans.

Spoon the warm mixture into your greased pans; pat smooth. I cut a piece of parchment paper and used it to press the mixture into the pan.  Press firmly without 'crushing' the cereal.  Let set, uncovered, 30 minutes and then run a knife or cake spatula around edges of cakes to loosen; unmold onto parchment paper.
Prepare Chocolate-Marshmallow Frosting (recipe below)

While frosting is still warm, pour onto center of 1 cake layer, and spread evenly to edges. (I did the bottom tier with the Chocolate Marshmallow Frosting and the middle and top with Marshmallow Frosting - same recipe just skip the chocolate).


Let stand 10 minutes to cool and set. Place second cake layer on top; press down gently. Using reserved pieces of Rice Krispies mixture, patch edges where frosting is visible.

Decorate with chocolate squares, arranging pieces around middle, use Peanut Butter Frosting to attach.

Recipe below.

I put each cake on a cardboard cake board the same size as each tier (4", 6" and 10" for the base) wrapped in foil.  I stacked the 3 tiers.  Decorate with Peanut Butter Frosting.  I chose to decorate the base of each tier with stars that covered the cake boards.  I used a 1M star tip.

I decorated the top tier of the cake by piping a border of peanut butter icing stars.  In the center I did 3 peanut butter stars and filled in between with some Milk Chocolate Ganache I had left over from another cake.

Let cake stand until firm enough to slice, at least 30 minutes or up to 2 hours. After 2 hours, wrap cake in plastic wrap to prevent it from getting too hard to slice.  

Chocolate-Marshmallow Frosting
1 1/2 tablespoons unsalted butter  
4 1/2 cups mini marshmallows (7 1/2 ounces)
3/4 cup semisweet chocolate chips 

Melt butter in a medium saucepan over medium-low heat. Add marshmallows; cook, stirring, until just beginning to melt. Add chocolate and stir until smooth.


Peanut Butter Frosting (Recipe from

1/2 cup butter
1 cup creamy peanut butter

4 cups confectioners' sugar
1/3 cup cream

In a large bowl, beat butter and peanut butter until light and fluffy. Slowly beat in 1/2 of the confectioner's sugar. Mix in 1/4 cup of the cream. Beat in the remaining confectioners' sugar. If necessary, add a little more cream or milk until the frosting reaches a good spreading consistency. 


  1. WHOA! I just scared the dogs I 'oooh'd' so loud. Awesome cake, well done!

  2. That whole cake only contained 10 tablespoons of butter? Well, good grief, that means it is practically health food! I might need to swing by later for more of it. I'm sure your sweetie wants to share some more of it, right? Nice work, Donna. Truly impressive!

  3. I should add that I've been planning salads for this week all morning. I'm pretty sure I gained at least three pounds last night. It was well worth it though.

  4. Parsley, thank you and your dogs for the chuckle this morning. : )

  5. Barefeet, Mr W did inform me that he planned on eating it for breakfast, lunch, dinner and a few snacks. So, maybe if you get here earlier enough... BTW, I do have 2 big buckets of peanut butter frosting and milk chocolate ganache if the cake is all gone.

  6. Barefeet, I am glad you enjoyed yourself! We had a blast!

  7. Amazing cake! I've never met a Rice Krispie treat I didn't love. :)

  8. How fun! What a neat idea, that is so cool =)

  9. oOOOHH...This looks soooo...good!!! Gorgeous!!! Im just crazy bout Italian food...Its my new found love...heee...heee...So glad to have stumbled upon ur blog..Happy to follow u..Keep rocking :)'
    Prathima Rao
    Prats Corner

  10. How could he possibly not love this. He'll be worshiping at your feet when he sees what you've done for him :-) It sounds strangely delicious. Have a great weekend. Blessings...Mary

  11. That great cake brings out the kid in all of us. I'm sure the cake was the hit of the party.

  12. fun cake :-) and he must have been a happy camper

  13. oh my! i love it! its so cute! an awesome treat indeed!

  14. how cool is this?! Love this idea!!! Beautiful and delicious for sure!

  15. What a fun, fun idea for a birthday cake! Well done!

  16. what a special idea, great job decorating it.

  17. Well, now that I spoke with you and realized that I didn't read the fine print (aka the actual butter content, ha ha), I suppose I'll just drool from afar. After all, I have already eaten half a dozen chocolate chip cookies today. The gym is going to hurt tomorrow!
    Thanks for a fun night,

  18. That looks awesome! I'd love to dig into that right now.

  19. Thanks for stopping by my blog and signing up to follow it! I now follow your wonderful blog too! I can't wait to spend time here looking at all of your delicious recipes!


  20. Fun idea,looks gorgeous and beautifully decorated cake.

  21. WOW! What a stunning cake...I'd love to have a taste of this beauty. My hubby, though, would pick Death by Chocolate...

  22. Wow, this is seriously impressive!! What an inventive idea for a "cake." :) I love this, you did such a great job. I'm sure your husband really appreciated it. Lucky guy!

  23. SO excited to find your blog! :-) OH MY GOODNESS! :-) This cake is AMAZING! :-)

  24. My church does a friendship dinner each year to help raise funds for our youth activities. The dinner includes a dessert auction. This would be PERFECT. I love to bake as well, but haven't had a lot of time to indulge this passion until recently. This would definitely be worth doing. Thanks for sharing.

  25. I think that mini Reese's cups would be good around this cake...


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