4-Ingredient Keto Peanut Butter Cookies
⏲ ~44 min total · prep 8 · cook 11 · 4 servings
Desserts⏱ 35 min total🔥 11.0g net carbs⚡ ≈283 kcal/serving~14% of calories from carbs
By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor
Published Sep 15, 2026 · Updated Sep 15, 2026
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Ingredients
- 1 cup unsweetened creamy peanut butter, stirred until fully smooth
- 3/4 cup powdered erythritol (or monk fruit blend)
- 1 large egg
- 1 tsp vanilla extract
- 1/4 tsp flaky sea salt, for finishing
Instructions
- Heat the oven to 350°F and line a half-sheet pan with parchment.
- Stir the peanut butter and powdered sweetener together until sandy, then work in the egg and vanilla; keep stirring 60 to 90 seconds until the mixture stiffens into a soft, play-dough-like dough. If it feels sticky, let it rest 5 minutes — the sweetener keeps hydrating.
- Roll 1 1/2-tablespoon balls (about 18 cookies) and space them 2 inches apart on the pan; they will not spread on their own.
- Press a classic crosshatch into each ball with the tines of a fork, dipping the fork in water between presses so it does not stick.
- Bake 10 to 12 minutes, until the edges are set, the tops look dry, and fine cracks web the surface — the centers will still feel soft, and that is correct.
- Cool the cookies completely on the pan, 20 to 30 minutes; they are fragile warm and firm up as the erythritol cools, so do not move them early.
- While they cool, pinch a few flakes of sea salt over each cookie; they are now crisp at the edge, chewy in the middle, and ready to store airtight for up to 4 days.
Why this recipe works
- Four ingredients, one bowl Four ingredients and about half an hour, and most of that is cooling. The dough itself takes five minutes of stirring.
- Powdered sweetener only Granulated erythritol stays gritty in a no-flour dough. The powdered kind dissolves into the peanut butter and is what keeps the middles chewy once the cookies cool.
- A dough that refuses to spread With no butter and no flour, these hold whatever shape you press. The crosshatch is not decoration; it is the only flattening that happens.
Tips for making this recipe well
Stir past combined
Keep going 60 to 90 seconds after the egg disappears, until the mixture stiffens into something like play dough. That extra stirring is what makes the dough rollable.
Let sticky dough rest
If it clings to your palms, wait five minutes. The powdered sweetener keeps hydrating while it sits, and the balls roll clean afterward.
Dip the fork in water
The dough grabs dry tines and can lift the whole ball right off the pan. A quick dip between presses solves it.
Underbake on purpose
Edges set, tops dry, fine cracks across the surface, and centers that still feel soft. That is done at 10 to 12 minutes; any longer and they harden as they cool.
Do not touch them warm
Warm cookies slide apart at the slightest nudge. They firm up as the erythritol cools, so give them the full 20 to 30 minutes on the pan.
Serving suggestions
The flaky salt goes on while they cool, and it does more than any frosting could. Pile them on a plate next to cold almond milk and call it done. At 11.0g net carbs a serving they land on the richer end of the dessert box, which is where a peanut butter cookie belongs. They pack well for lunchboxes and road trips, since nothing melts at room temperature.
Storage and meal prep
They keep up to 4 days in an airtight container, with parchment between layers so the salt flakes do not transfer. The texture holds better in the fridge if your kitchen runs warm, since erythritol can loosen in heat. For longer storage, freeze them up to 2 to 3 months and thaw at room temperature for about 20 minutes. Straight from the freezer they chew like fudge.
Variations worth trying
- Crunchy peanut butter Swap in crunchy and change nothing else. The dough rolls the same and the edges get little nutty shards.
- Chocolate bottoms Melt a few sugar-free chocolate chips and dip half of each cooled cookie. Chill 10 minutes so the coating sets.
- Salt-forward Double the flaky salt on top if you like the sweet-salt contrast loud. Skip extra salt in the dough itself.
Frequently asked questions
Why did my cookies fall apart?
They were moved while warm. Erythritol-sweetened cookies are fragile hot and firm as they cool, so the 20 to 30 minutes on the pan is structural, not optional.
Can I use granulated sweetener?
The texture will turn gritty and the dough will roll looser. Powdered erythritol or a powdered monk fruit blend is what this dough is built on.
Do they really not spread?
They do not, which is why spacing and the crosshatch press matter. Whatever shape goes into the oven is the shape that comes out.
How do I double the batch?
Mix two batches in separate bowls rather than one giant one. The 60 to 90 second stir is hard to judge at double volume.
Are they done when the centers feel soft?
Yes. Edges set, tops dry, cracked surfaces, soft centers; the last part firms up during the cool.
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As an Amazon Associate and affiliate partner, Keto Food Ideas earns from qualifying purchases at no additional cost to you. Nutritional values are estimates. Recipes are developed with AI assistance and reviewed by our editors before publishing.
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