Kirbie's Cravings

3 Ingredient Flourless Cashew Butter Mug Cake

flourless cashew butter mug cake

This easy mug cake is just three ingredients. It’s fluffy, flourless and tastes of cashews.

Sometimes it’s hard to believe that when I was a kid, the spread options for my toast were pretty much limited to margarine, peanut butter or jelly/jam. Now there are endless spread choices readily available like almond butter, Nutella, cookie butter, and more. I have an entire pantry shelf just dedicated to various spread flavors I find at the grocery store.
a close-up photo of a spoonful of flourless cashew butter cake
I was really excited when cashew butter became a more common grocery item a few years ago. Growing up, my favorite nut was the cashew. I could probably eat an entire container if I was allowed to. So far, I’ve only used cashew butter for my breakfast, but I decided it was about time I made a mug cake with it.

This cake came out smelling so great I nearly burned myself trying to take a bite too soon. Yes, I always tell people to wait a few minutes before consuming, but I rarely heed my own advice.
a close-up photo of flourless cashew butter cake in a white mug
If you enjoy this recipe, be sure to check out my 3 Ingredient Flourless Peanut Butter Mug Cake, 3 Ingredient Flourless Nutella Mug Cake or 4 Ingredient Flourless Almond Butter Mug Cake.


3 Ingredient Flourless Cashew Butter Mug Cake

Servings: 1 mug cake
Prep Time: 4 minutes
Cook Time: 1 minute
Total Time: 5 minutes
Course: Dessert
Cuisine: American
This flourless cashew butter mug cake is so easy to make - you only need three ingredients and a few minutes to make it!
5 from 2 votes


  • 3 1/2 tbsp cashew butter see note
  • 1 1/2 tbsp granulated white sugar
  • 1 large egg


  • Add all ingredients into a microwave-safe mug (I recommend using a mug that can hold at least 10 oz of liquid as the cake will initially rise quite high before sinking back down). Vigorously mix with a mini whisk until batter is completely smooth. I highly recommend using a mini whisk rather than a fork, as you really need to thoroughly mix the batter just the same as any cake batter. You do not want any egg streaks to go unmixed.
  • Cook in the microwave at full power for about 1 minute 15 seconds. Top of cake should look mostly done but may still be slightly gooey around the edges. Let cake cool a few minutes before eating. If desired, you can top with frosting, syrup or more spread.


If you follow a gluten-free diet, double check to make sure the cashew butter brand you are using is gluten-free. I used Jif brand, but can't say for sure that it is gluten-free.

The nutrition information provided are only estimates based on an online nutritional calculator. I am not a certified nutritionist. Please consult a professional nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.

Did you make this recipe?I'd love to see it! Mention @KirbieCravings and tag #kirbiecravings!

3-ingredient flourless cashew butter mug cake photo collage

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Recipe Rating

8 comments on “3 Ingredient Flourless Cashew Butter Mug Cake”

  1. I almost wish I hadn’t learned about this cake! LOL it’s really lovely.  A nice treat with coffee.  

  2. Is there an egg substitute? 

  3. Made multiple times—great!

  4. Surprisingly awesome. I can’t have much sugar so cut back to 2 teaspoons. Was wonderful.