Peanut Butter Hot Fudge Cake: slow cookers aren't just for soup

We’ve been on a roll here with our slow cooker resurgence. We’ve made soup, and brown bread.  We’ve gathered more recipes from our friends to try later, and we’ve even made cheesecake. Slow cookers are super versatile, and we’re lovin’ it.

So, what’s up next on our cookerfest menu?

How about another dessert? How about another dessert that includes two of America’s favorite flavors? How about a dessert that’s a peanut butter cake with magic hot fudge topping?

Hey MJ, how about you stop teasing and just get to the recipe?!

Um, sure I can, stomach that. How about you stop being a back seat digestive organ?!

Without any further ado, here’s the recipe for Slow Cooker Peanut Butter Hot Fudge Cake.


In a small bowl or measuring cup, blend together 1/2 cup  peanut butter, 1/2 cup milk, 2 tablespoons melted butter, and 1 teaspoon vanilla. I find placing the whole thing in the microwave for 20 seconds or so makes the blending much easier.


In a large bowl, place 1 cup of King Arthur Unbleached All-Purpose flour, 1/2 cup of granulated sugar, 1 teaspoon of baking powder and 1/2 teaspoon of salt. Whisk together well, then pour the peanut butter mixture over the top of the dry ingredients.



Mix together to form a thick cake batter. Depending on your peanut butter, your batter may be thick like a quick bread, or thinner like a regular cake batter. I tried both natural and commercial peanut butter, and both will work in the recipe.

If the batter is very thick, add another 2-3 tablespoons of milk to make it more pourable.

Place the batter into a well greased 4 to 6 quart slow cooker.


Now for the chocolate fudge sauce. I used the same bowl to combine 1/2 cup of sugar, 1/4 cup of King Arthur All-Purpose Baking Cocoa and 1 cup of boiling water. It will take a minute to whisk together into a thin chocolate liquid.

Pour this over the top of the peanut butter batter in the crock. DO NOT STIR TOGETHER! Just let the liquid sit on top of the cake.

Cover the cooker and “bake” on high heat for 2 to 3 hours.


Oh lordy, that is no beauty queen cake now is it? BUT it smells divine, like the biggest Reese’s cup in history. Warm peanut butter cake now sits atop a lake of thick chocolate sauce. Little chocolate rivers run all throughout too.

Serve the cake warm right from the crock. Don’t worry about neatness, that’s for other cakes. Scoop up big globs of cake and fudge, and top with vanilla ice cream or whipped cream. Scrape up some more fudge and drizzle it over the top. Grab a spoon and dig in.

This cake is perfect for game day, when you need a little something sweet after all those chicken wings and nachos. It is also perfect for a weeknight dessert. Older kids can mix this up in a jiffy when they arrive home from school, and dessert will be ready by the time you roll home.  Now, how’s that for teamwork?

Please make, rate and review our recipe for  Slow Cooker Peanut Butter Fudge Cake.

Print just the recipe

Would you rather turn on the oven? Check out our other pudding cake recipes.


MaryJane Robbins

MaryJane Robbins grew up in Massachusetts and moved to Vermont 20 years ago. After teaching young children for 15 years, she changed careers and joined King Arthur Flour in 2005. MaryJane began working on King Arthur Flour's baker’s hotline in 2006, and the blog team ...


    1. The Baker's Hotline

      I’m sorry, we haven’t attempted this recipe with a gluten free flour. I will certainly suggest this to our test kitchen! Jon@KAF

    1. The Baker's Hotline

      Sorry, this is not something we have tried with this recipe. However, feel free to give it a try! Jon@KAF

  1. Kathy

    This recipe looks yummy and I plan to try it. Does the cake stick to the slow cooker? I saw a “America’s Test Kitchen” show on TV last week and they did bread pudding in the slow cooker. To avoid sticking to the sides they first lined the cooker with aluminum foil then put the ingredients inside that.

    1. The Baker's Hotline

      It is likely that this cake will stick to your crock pot! MJ made sure to well grease her pot before placing in any ingredients. Also, the aluminum foil or even parchment cut to fit the pot will help to prevent sticking. Jon@KAF

  2. Amy

    Ann, I’m just a fellow home baker, but I thought I would let you know that I whipped up this cake this afternoon and it is currently in a 6 qt crock pot. This is my first crock pot cake. I doubled the recipe and believe it will take 2 hours +/- in a 6 qt crock pot. It has been on for an hour on high and has doubled in size. It is very moist. I don’t expect it to take more than 1 more hour max. My crock pot is around 5 years old.

  3. Patty

    I second Ann’s question – I used to be able to cook spaghetti sauce in my slow cooker, but slow cookers I have had in the last 10 years have hot spots and always burn it (if I am away at work all day and can’t stir).

    Obviously, this isn’t one for when you’re at work, but I am thinking one may need to be around the move the crock portion around so there is one hot spot.

  4. Judi

    With the slow cooker recipes, please, please, please note what size you did the test recipe in. This can make a significant difference!

  5. Nikki Pals

    I rarely use my slow cooker (Dutch oven or pressure cooker for me) is it possible to give baking instructions for the oven?

    1. The Baker's Hotline

      I am sorry to say that we don’t have instructions at this time for baking this cake in your oven. However, I will ask MJ and see if she has any tips. Jon@KAF

    2. Lisa Meyer

      Normally, slow cooker temps convert – 200 degrees for low and 300 degrees for high…with that being said, I would start checking it at 15 minute increments after an hour…

  6. Ann

    How old is your slow cooker? I ask, because I understand that newer cookers cook at hotter temperatures than the first generation models.

    1. MaryJane Robbins, post author

      HI Ann,
      My cookers are about 5 to 8 years old, so not super new. It’s definitely going to vary the cooking time if you have a much older or much newer cooker, but thankfully the recipe is flexible and easy to keep an eye on. ~ MJ

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