Keto Peanut Butter Lava Cake: Make it now, thank me later

I’ve been riding the struggle bus this week.Some people  may tell you since they started Keto they no longer want bread or sweets… I am not one of those people.

While I don’t have the intense cravings like I used to, I enjoy an daily occasional sweet treat.

One thing that has changed since we started keto is I eat my feelings less, as evidence by my 40 pound weight loss (Can I get an AMEN).

Don’t get me wrong, I contemplated sitting on the couch with a Hallmark movie, half gallon of ice cream and a spoon but I remained keto strong . I decided to use my evil power channel my energy into creating something.

Now before you ready any further, this recipe has peanut butter, so if you are the keto police and are going to bash my Skippy, move along there’s nothing to see here.

This lava cake also has chocolate because… well, that’s how my mind works. If you don’t like chocolate, I’m sorry but we can’t be friends, now move along.

I’ve talked about how I like to melt peanut butter and chocolate together, but I needed a way to make it  a little more socially acceptable. Can you believe that there are Judgy McJudgers out there? I know, it’s hard to believe people judge. Not that I give an ef… I give zero.

I was thinking about cake and have made a bunch of mug cakes and lava cakes pre-keto and BOOM, a peanut butter lava cake was born!

Yep, this is all you need to create an ooey, gooey, peanut butter lava center cake.

That my friends is some mad scientist shit right there!

I told you friends, I got you. We can have great things living the keto life!

First, spray your ramekin (I got these on Amazon over a year ago and they’re great in the instant pot too).

Next you want to melt the butter:

Add brown sugar swerve and cocoa powder and vanilla extract:

Next add your Skinny Syrup Peanut Butter cup. If you don’t have this, NBD. It adds a hint of peanut butter flavor and sweetness. You could add a touch more PB and vanilla.

Add cinnamon and egg. Stir until well combined. If you don’t, you will have egg chunks in your cake (true story). When fully mixed it should look like this:

Now for the best part. Drop the PB right in the center and push it down a bit.

Be sure to put some of the batter over the pb and pop that bad boy in the microwave (yep, that easy) for 70-80 seconds. It should be firm on top and not liquidy on the edges.

Mine looked like this:

Take a knife around the edges if sticking and then put a plate over the top and flip:

Then enjoy!

Mine came out a little crooked this time I was playing around with time, and that’s ok. The taste is SO good.

Choosing the keto life doesn’t mean you have to choose between being healthy and enjoying a tasty treat. I really love creating things to fit a need!

Word of warning, this is calorie heavy, but I normally have more than enough to spare and try to  have it on a day that I do a lot of cardio.

Peanut Butter Lava Cake

Prep Time: 4 minutes
Cook Time: 1 minute
Total Time: 5 minutes
Course: Dessert
Keyword: lava cake, mug cake, peanut butter
Servings: 1 Cake
Calories: 410kcal
Author: Kari Hale


  • 2 tbsp Melted Butter
  • 2 tbsp Rodell Cocoa
  • 2 tbsp Brown Sugar Swerve
  • 1/4 tsp Cinnamon
  • 1 tsp Vanilla Extract
  • 1 Egg
  • 1 tbsp Skinny Syrup Peanut Butter Cup (Optional)
  • 1 tbsp Natural Creamy Peanut Butter


  • Spray Ramekin with non-stick cooking spray
  • Mix everything except Peanut Butter in Ramekin until combined
  • Make a well in center and add Peanut Butter
  • Cover Peanut with a bit of the batter
  • Add a pinch of salt if desired
  • Microwave for 70 seconds or until firm
  • Place small plate over Ramekin and flip upside down. 
  • (If cake is stuck to the sides, loosen with a butterknife)
  • Carefully lift Ramekin away. 


Serving: 1Cake | Calories: 410kcal | Carbohydrates: 4.2g | Protein: 11.8g | Fat: 37g
Tried this recipe?Let us know how it was!

Net carbs can be reduced using a lower carb Peanut Butter option, but when I experiment I use the cheap stuff!

Leave us a comment and let us know what you would like to see!  So enjoy lava cake this week and let’s keto!