These 3-ingredient peanut butter oatmeal cookies are baked with creamy peanut butter, light brown sugar, and old-fashioned rolled oats. They contain no eggs or flour and bake in 10-12 minutes, with chewy centers and lightly crisp edges.
Why You'll Love These Peanut Butter Oatmeal Cookies
- A short ingredient list: Peanut butter, light brown sugar, and rolled oats form the complete cookie dough.
- No eggs or flour: The peanut butter binds the dough while the oats give each cookie a hearty texture.
- Cookie-like texture: Light brown sugar creates chewy centers that contrast with the lightly crisp edges.
- Simple preparation: The dough comes together in one bowl without a mixer.
Some days, I want a homemade cookie without measuring a long list of ingredients. That is when I return to these three-ingredient peanut butter oatmeal cookies. They feel heartier than my 3 ingredient peanut butter cookies, while keeping the same uncomplicated approach. When I want oats without peanut butter, my 3 ingredient oatmeal cookies offer a softer, banana-based alternative. This brown-sugar version remains my choice when I want a chewy cookie with crisp edges.
I use old-fashioned rolled oats because their texture stays visible inside each cookie. Light brown sugar keeps the centers chewy, while the peanut butter provides richness and structure. Unlike my banana oatmeal cookies, these rely on peanut butter and sugar rather than fruit. I mix the base until smooth, fold in the oats, then flatten every portion before baking. The result shares the richness of my flourless peanut butter cookies, with a heartier bite from the oats.
Key Ingredients in 3-Ingredient Peanut Butter Oatmeal Cookies
The exact measurements are in the recipe card below, but each ingredient has a specific role.
- Shelf-stable creamy peanut butter: For the base, I use it because its consistent texture binds the flourless, eggless dough.
- Light brown sugar: Its moisture gives me the chewy center I want while adding sweetness.
- Old-fashioned rolled oats: I prefer them because they add visible oat texture and make each cookie feel more substantial.
How to Make 3-Ingredient Peanut Butter Oatmeal Cookies
The complete printable recipe appears below, but this is the four-step overview.
1. Mix the base: Stir the creamy peanut butter and light brown sugar together until smooth and fully combined.
2. Add the oats: Fold in the old-fashioned rolled oats until a thick dough forms.
3. Shape the cookies: Divide the dough into equal portions, arrange them on the prepared baking sheet, and flatten each one.
4. Bake and cool: Bake until the edges are set and lightly golden, then cool before transferring to a wire rack.
Tips for 3-Ingredient Peanut Butter Oatmeal Cookies
- Flatten before baking: The cookies do not spread much, so shape them to the thickness you want before they enter the oven.
- Use parchment paper: Line the baking sheet so the soft cookies release cleanly after their initial cooling period.
- Choose the texture: Bake closer to 10 minutes for softer centers or 12 minutes for a firmer cookie.
Storage
I store these peanut butter oatmeal cookies in an airtight container at room temperature for up to four days. For longer storage, I freeze them in a freezer-safe container for up to two months.
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Recipe
3-Ingredient Peanut Butter Oatmeal Cookies
Ingredients
- 250 g shelf-stable creamy peanut butter
- 100 g light brown sugar
- 80 g old-fashioned rolled oats
Instructions
- Preheat the oven to 180 °C. Line a baking sheet with parchment paper.
- Mix 250 g shelf-stable creamy peanut butter and 100 g light brown sugar in a medium bowl until smooth and fully combined.
- Stir in 80 g old-fashioned rolled oats until evenly incorporated and a thick dough forms.
- Divide the dough evenly into 14 portions. Shape each portion into a ball, arrange them about 2 inches apart, and gently flatten them.
- Bake for 10-12 minutes, until the edges are set and lightly golden. Cool on the baking sheet for 5 minutes, then transfer the cookies to a wire rack to cool completely.
Notes
Nutrition
Nutritional information is based on third-party calculations and should be considered an estimate only. Actual nutritional content will vary based upon brands used, measuring methods, cooking method, portion sizes, and more.
Pauline says
These peanut butter oatmeal cookies were surprisingly good for just three ingredients, I’m making them again.