Briana Culberson's Husband Ryan Shares a 5-Ingredient Keto Dessert Recipe "You'll Want to Save"

Vicki Gunvalson's son-in-law Ryan Culberson shared a Keto-friendly "Peanut Butter Mug Cake" recipe.

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These days, Vicki Gunvalson's daughter Briana Culberson and son-in-law Ryan Culberson are all about the Keto diet. In fact, The Real Housewives of Orange County couple says Keto transformed their health as well as their appearance in several months' time — and they're devoted to it.

As well using social media as a place to document the couple's progress, Ryan uses his Instagram to share lots of Keto food ideas. And his latest recipe suggestion is one — according to Ryan — you're definitely going to "want to save the recipe for."

So what is it? Well that would be "Peanut Butter Keto Mug Cake," which looks plenty easy as well as fast to whip up — and a great option for a party of one (or more). Ryan shared a photo of the recipe handwritten on a piece of yellow lined paper. But if you want to save it, as Ryan suggests in his disappearing Instagram Stories — we immortalized it for you below.

And yes, this certainly looks like one example in Ryan's evidence file that refutes the notion that "Keto is so hard."

Keto Peanut Butter Mug Cake

2 tablespoons peanut butter (natural, unsweetened)

1 tablespoons Kerrygold butter

2 tablespoons granular Swerve

1/2 teaspoon baking powder 

1 egg

Soften and mix peanut butter and butter. Then mix in Swerve [zero-calorie sweetener], baking powder, and egg. Microwave for 60 seconds in greased mug. Top with Lily's chocolate chips.

Here's what celebrities have to say about Keto — both glowing and... not so much:

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