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    Home » Keto Cakes » Keto Chocolate Peanut Butter Lava Cake

    Published: Sep 8, 2021 by Carolyn

    Keto Chocolate Peanut Butter Lava Cake

    This post may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.

    65.1K shares
    Jump to Recipe Print Recipe

    This keto lava cake will blow your mind. Gooey warm chocolate cake with a center of molten peanut butter. You won’t believe it’s sugar free and only 4g net carbs per serving!

    Titled image of keto chocolate peanut butter lava cake broken open to show the gooey inside.

    I am having such fun going back and tweaking old recipes like this one. This keto lava cake has always been one of my favorite desserts.

    How can you go wrong with a warm peanut butter center oozing out all over you plate? That’s right, friend, you can’t. You simply can’t go wrong with this classic recipe.

    Chocolate and peanut butter is ketolicious!

    Have I ever mentioned how much I love chocolate and peanut butter together? Um, maybe just a few times.

    You may have seen me mention it in my keto peanut butter cups. Or maybe I dropped a hint when I was waxing poetic about keto peanut butter pie.

    It’s a little frightening, how much I love peanut butter and chocolate together. It’s a flavor combination that is never far from my mind, even when I am in the midst of creating another recipe altogether.  

    And I know I am not the only one who feels this way. Whenever I post a peanut butter and chocolate recipe, it gets a great deal of attention. In fact, my keto peanut butter bars went so viral, Facebook slapped a warning label on them. Weird but true!

    Keto peanut butter lava cake on a white plate with a strawberry beside it.

    Ingredients for peanut butter chocolate lava cakes

    You only need a few simple ingredients to make these gorgeous keto lava cakes. Get your shopping list ready!

    • Unsweetened chocolate: By unsweetened, I mean absolutely no sweetener at all. This should be 100% cacao chocolate and I urge you to purchase a quality brand like Ghirardelli or Guittard. Good quality makes a big difference!
    • Butter: Melting butter with the chocolate gives the base for these decadent cakes.
    • Sweetener: I prefer Swerve Granular in these cakes but they work with any erythritol based sweetener. I haven’t tried allulose in them but I imagine it too would work.
    • Eggs: This keto lava cake recipe uses one whole egg and one egg yolk. The yolk provides extra richness and makes them even gooier.
    • Almond flour: Classic lava cakes take only a little flour and in this case, we simply use 3 tablespoons.
    • Vanilla extract: For flavor!
    • Peanut butter: I recommend a good, creamy peanut butter like Justin’s, as you want it to ooze out when the cakes break open.
    Close up shot of keto lava cake on a plate, broken open to show the peanut butter oozing out.

    How to make keto lava cakes

    The process is really quite simple and fun. Let’s review:

    1. Prep three ramekins. Grease them really well with a solid fat like butter or coconut oil. Then dust them lightly with cocoa powder. This allows the cakes to release more easily after baking.
    2. Melt the chocolate and the butter. I do this in the microwave but it can also be done on the stove. Whatever method you choose, be sure it’s gentle so you don’t seize the chocolate. I do 30 second increments in the microwave, stirring in between.
    3. Whisk in the sweetener, then the eggs. As long as you took care not to overheat the chocolate, adding the eggs to the warm mixture should be fine.
    4. Stir in the almond flour, vanilla, and salt.
    5. Spoon batter into the ramekins. You need about two thirds of the batter to cover the bottoms of the ramekins.
    6. Dollop in the peanut butter. Use about 2 to 3 teaspoons for each keto lava cake.
    7. Top with remaining cake batter. Be sure to cover the peanut butter completely!
    8. Bake. 10 to 12 minutes at 375F bakes the cake but leave the centers nice and gooey.
    9. Invert. Run a sharp knife around the outside of the cakes before flipping out onto a plate.
    10. Dig in! Grab a fork and enjoy these delicious keto lava cakes.
    Keto chocolate peanut butter lava cake on a white plate with ice cream and a strawberry on top.

    Frequently Asked Questions

    I’m allergic to peanut butter, can I use a different filling?

    Absolutely! Almond butter works well, but you could also use the new super creamy sugar free chocolate hazelnut spread from ChocZero. Delicious!

    Can these be made dairy free?

    I haven’t tried to make keto lava cakes without butter but I think dairy free substitutes would work just fine.

    What do you bake them in?

    I recommend using ½ cup capacity ceramic ramekins. Any larger and the cake batter will be spread too thin.

    Can I use a different sweetener?

    I have only tried these keto lava cakes with Swerve but I think any erythritol based sweetener would work. Allulose may work as well, but I can’t guarantee that.

    A fork taking a scoop of chocolate peanut butter lava cake out of the main part of the cake.
    Titled image of keto chocolate peanut butter lava cake broken open to show the gooey inside.

    Keto Lava Cakes Recipe

    This keto lava cake will blow your mind. Gooey warm chocolate cake with a center of molten peanut butter. You won't believe it's sugar free and only 4g net carbs per serving!
    5 from 19 votes
    Print Pin Rate
    Course: Dessert
    Cuisine: Dessert
    Keyword: chocolate peanut butter lava cake, keto lava cake
    Prep Time: 10 minutes
    Cook Time: 12 minutes
    Total Time: 22 minutes
    Servings: 3 servings
    Calories: 345kcal

    Ingredients

    • ¼ cup butter
    • 1 oz unsweetened chocolate chopped
    • 3 tablespoon Swerve Sweetener
    • 1 large egg
    • 1 large egg yolk
    • 3 tablespoon almond flour
    • ¼ teaspoon vanilla extract
    • Pinch salt
    • 2 tablespoon peanut butter
    US Customary – Metric

    Instructions

    • Preheat the oven to 375F and grease 3 small ramekins. Dust the ramekins with cocoa powder and shake out the excess.
    • In a microwave safe bowl, melt the butter and chocolate together, whisking until smooth. Alternatively, you can melt it carefully in a pan over low heat. 
    • Add the sweetener and whisk until combined. Then add the egg and egg yolk and whisk until smooth. Whisk in the almond flour, vanilla extract, and salt until well combined.
    • Divide about two thirds of the batter between the three ramekins, making sure to cover the bottoms.
    • Divide the peanut butter between the ramekins, placing in the center of the batter. Cover with the remaining batter and spread to the edges.
    • Bake 10 to 12 minutes, or until the edges of the cakes are set but the center still jiggles slightly. Remove and let cool 5 to 10 minutes. Then run a sharp knife around the edges and flip out onto plates.

    Video

    Nutrition Facts
    Keto Lava Cakes Recipe
    Amount Per Serving (1 cake)
    Calories 345 Calories from Fat 275
    % Daily Value*
    Fat 30.5g47%
    Carbohydrates 6.9g2%
    Fiber 2.9g12%
    Protein 8.4g17%
    * Percent Daily Values are based on a 2000 calorie diet.
    65.1K shares

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    Nutritional Disclaimer

    Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

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    Comments

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      Recipe Rating




    1. Denlee says

      July 03, 2022 at 11:27 pm

      Hi! Can I use cocoa powder instead of chocolate bar?

      Reply
      • Carolyn says

        July 04, 2022 at 7:48 am

        Hi there… google the conversion of cocoa powder to unsweetened chocolate. There is a formula for it, I just can’t remember exactly.

        Reply
    2. Hayley says

      March 23, 2022 at 3:22 pm

      5 stars
      I’ve made this 4 times in the last two weeks. I did it exactly as you said, and delicious every time. My whole family loved it, even my picky 7yo! Thanks for your hard work!

      Reply
      • Carolyn says

        March 23, 2022 at 6:43 pm

        So happy to hear it!

        Reply
    3. Carolyn says

      January 08, 2022 at 3:14 pm

      Anything that doesn’t kick out of ketosis is keto friendly. 🙂 Do as you wish, however.

      Reply
    4. Stephanie says

      January 08, 2022 at 10:36 am

      Can this recipe be made dairy free?

      Reply
      • Carolyn says

        January 08, 2022 at 11:25 am

        Sure, use coconut oil.

        Reply
    5. Darlene says

      January 08, 2022 at 10:01 am

      5 stars
      This recipe looks amazing. Could you freeze these and just reheat them?

      Reply
    6. Caroline Nielson says

      December 01, 2021 at 10:16 pm

      5 stars
      I just made these for my hubby for his birthday as he’d requested lava cakes and this was absolutely delicious !
      The combination of chocolate and peanut butter just can’t be beat.
      Thanks for the recipe Carolyn 🙂

      Reply
      • Carolyn says

        December 02, 2021 at 7:30 am

        So glad to hear it!

        Reply
    7. Katie says

      October 16, 2021 at 3:38 pm

      5 stars
      These are a great option for a keto dessert! I love the addition of peanut butter with these.

      Reply
    8. Matt J Taylor says

      October 16, 2021 at 2:28 pm

      5 stars
      This molten chocolate peanut butter cake is so good! Who knew keto recipes could taste this amazing.

      Reply
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