3-Ingredient Keto Peanut Butter Cookies
These 3-ingredient keto peanut butter cookies mix up in one bowl with pantry staples you already have. They bake into soft, chewy rounds with a strong roasted peanut taste and zero sugar.
No flour, no grains, and no odd aftertaste. Just a fork, a bowl, and about 20 minutes from start to finish.
What Makes These So Good
The center stays tender while the edges set into a firm, chewy rim. The peanut butter flavor leads, not the sweetener, so each bite tastes like a real peanut butter cookie.
They are the cookie I reach for when I want something sweet but not heavy. Because they skip flour and sugar, they fit a keto day with no fuss, and they don’t leave you with that fake-sweet film.
Ingredients
- 1 cup creamy natural peanut butter: the drippy kind with no added sugar or oils, stirred well if separated.
- ½ cup powdered erythritol sweetener: powdered dissolves better than granular and avoids grittiness. Monk fruit blends work, too.
- 1 large egg: at room temperature so the dough comes together smoothly.
- Pinch of salt: only if your peanut butter is unsalted; most natural brands have enough.
Variations
- Vanilla or chocolate chips: stir in ½ teaspoon vanilla extract or a handful of sugar-free chocolate chips before scooping.
- Crunchy peanut butter: swap for creamy to add tiny peanut bits throughout the cookie.
- Different sweetener: allulose creates a slightly softer, more tender cookie, but the same ½ cup works. Increase baking time by 1 to 2 minutes if needed.
Chewy Keto Oatmeal Cookies are another reader favorite dessert worth making next.
How to Make 3-Ingredient Keto Peanut Butter Cookies
Step 1: Mix the Dough
Spoon the peanut butter into a medium bowl. Add the ½ cup powdered sweetener and stir with a sturdy spatula until the sweetener is fully absorbed and the mixture looks smooth with no dry streaks. Crack in the egg and mix again until the dough thickens and pulls away from the sides of the bowl. It will be sticky but shapeable.
Step 2: Shape the Cookies
Scoop level tablespoons of dough and roll them between your palms into 12 neat balls. Set them about 2 inches apart on a parchment-lined baking sheet. Press each ball with the tines of a fork to make a crosshatch pattern, flattening them to about ½ inch thick. The fork may stick a little; dip it in cold water between presses if needed.
Step 3: Bake the Cookies
Heat the oven to 350°F (175°C). Slide the sheet onto the middle rack and bake for 10 to 12 minutes. The cookies will puff slightly and the edges will look set and dry while the centers stay soft. Do not let them brown deeply or they will turn crisp as they cool.
Step 4: Cool and Serve the Cookies
Let the cookies rest on the hot baking sheet for 5 minutes. They firm up during this time and won’t fall apart when you move them. Transfer to a wire rack to cool completely and the centers will finish setting into a chewy bite. Serve once they are cool enough to hold.
A Few Tips Before You Start
- Use a room temperature egg so the dough does not seize or turn lumpy when mixing.
- Powdered sweetener is key; granular erythritol can leave a crunchy texture in the cookies.
- Do not overbake; pull the sheet when the edges are just set and the tops look matte.
- These cookies spread very little, so the spacing only needs to be about 2 inches.
Storing Leftover Cookies
- Refrigerate: store in an airtight container for up to 5 days. They stay chewy straight from the fridge.
- Freeze: layer between parchment in a freezer container for up to 2 months. Thaw at room temperature for 15 minutes.
Frequently Asked Questions
Can I use crunchy peanut butter instead?
Yes, crunchy peanut butter adds little peanut bits that toast slightly in the oven. The dough handles the same way.
What sweetener works best?
Powdered erythritol or a monk fruit and erythritol blend gives the cleanest texture. Allulose makes a softer cookie. Avoid pure stevia drops, as they don’t provide the bulk.
Why did my cookies spread into puddles?
This happens if the peanut butter is too warm or has extra oil. Stir the peanut butter thoroughly before measuring and keep the dough cool, not warm.
Can I double the recipe?
Yes, double all ingredients and bake on two sheets, rotating racks halfway. The 10 to 12 minute bake time stays the same.
3-Ingredient Keto Peanut Butter Cookies Recipe
Ingredients
Method
- Stir peanut butter and sweetener in a bowl until smooth. Mix in the egg until a thick dough forms.
- Roll into 12 balls, place on a lined baking sheet, and press with a fork to flatten.
- Bake at 350°F (175°C) for 10 to 12 minutes, until edges are set.
- Cool on the sheet 5 minutes, then transfer to a wire rack to cool completely before serving.
Notes
