Three years into keto, a regular at my supper club finally admitted the thing he missed most wasn’t bread or pasta — it was his mom’s peanut butter cookies, the ones with the fork marks pressed on top. He’d tried a few “keto” versions from the store and said they all tasted like sawdust with an apology. So I took it as a personal challenge. Six batches, two flour swaps, and one very important discovery about sweeteners later, these keto peanut butter cookies were the ones he said tasted like his mom’s — no apology needed.

Table of Contents

Why This Recipe Works
A Note on Sweeteners
Ingredients
How to Make Keto Peanut Butter Cookies
Pro Tips
How to Store and Freeze
Frequently Asked Questions
Nutrition
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Close-up of a keto peanut butter cookie broken in half

Why This Recipe Works

Traditional peanut butter cookies barely need flour to hold together — that’s the trick this recipe leans on:

Natural, no-stir peanut butter provides most of the structure on its own, so almond flour only needs to fill in the gaps rather than carry the whole cookie.
An egg binds everything without adding carbs, which matters since low-carb flours don’t develop gluten the way wheat flour does.
Baking soda, not baking powder, gives just enough lift without drying the dough out further.

The keto diet itself works by keeping net carbs low enough — generally under 20 to 50 grams a day, according to Harvard Health — that your body shifts to burning fat for fuel instead of carbohydrates, which is why every ingredient choice here is deliberate.

A Note on Sweeteners

I want to be upfront about something most keto recipes don’t mention. Erythritol is the most common keto-friendly sweetener, but recent Cleveland Clinic research has linked high blood levels of erythritol to an increased risk of blood clots, heart attack, and stroke. The research is still developing, and occasional use is a different picture than daily high intake, but if this is a concern for you, allulose or monk fruit sweetener are reasonable alternatives in this recipe — the texture will be very slightly different, but the method stays the same.

Ingredients

1 cup (256g) natural, no-stir peanut butter
½ cup (100g) granulated keto sweetener (erythritol, allulose, or monk fruit blend)
1 large egg
1 tsp vanilla extract
½ tsp baking soda
¼ tsp salt
2 tbsp almond flour, if needed for consistency

Nut-free note: this recipe relies on peanut butter for its structure, so a direct swap to seed butter (like sunflower seed butter) will work, but expect a slightly different flavor.

How to Make Keto Peanut Butter Cookies

Peanut butter and sweetener mixed together in a bowl

Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
Mix the peanut butter and sweetener together until fully combined and smooth.
Beat in the egg and vanilla until the mixture is glossy.
Add the baking soda and salt, mixing until combined. If the dough feels too loose to scoop, add the almond flour a tablespoon at a time.

Cookie dough balls with fork marks pressed on top before baking

Scoop into balls and place on the tray, then press each one down with a fork in a crisscross pattern.
Bake for 8–10 minutes, until the edges just turn golden. These cookies firm up significantly as they cool, so don’t wait for them to look fully set in the oven.
Cool completely on the tray before moving — they’re very delicate while warm and will firm up as they cool.

Finished keto peanut butter cookies cooling on a tray

Pro Tips

Use natural peanut butter, not the shelf-stable kind with added sugar and stabilizers — check the label, since many popular brands add more carbs than you’d expect.
Don’t skip cooling time — these cookies are fragile straight from the oven and firm up as they sit.
If your dough is oily, your peanut butter may be more liquid than average; a tablespoon of almond flour will absorb the extra moisture.
Want a version made with real sugar instead? Try our Betty Crocker-Inspired Chocolate Chip Cookies for a classic, non-keto treat.

How to Store and Freeze

Room temperature: Store in an airtight container for up to 5 days.

Freezer: Freeze baked cookies in a single layer, then transfer to a freezer bag for up to 2 months.

Frequently Asked Questions

Can I use a different sweetener?

Yes — any granulated 1:1 keto sweetener works, including allulose or monk fruit blends. See our note on sweetener safety above if you’re deciding between options.

Why are my cookies crumbly?

This usually means the dough needed more moisture. Make sure you’re using natural, oily peanut butter rather than a very dry or stabilized variety.

Is this recipe also gluten-free?

Yes, this recipe is naturally gluten-free since it uses peanut butter and almond flour instead of wheat flour. For a dedicated gluten-free dough recipe, see our Gluten-Free Cookie Dough.

How many net carbs are in one cookie?

Using a keto-friendly sweetener with zero net carbs, each cookie has approximately 2g net carbs. This will vary slightly depending on the exact sweetener and peanut butter brand you use.