Oat Flour Peanut Butter Cookies (Chewy & Gluten-Free)

By Daisy Sullivan

On March 12, 2026

A bright and airy flat lay of freshly baked chewy gluten-free peanut butter cookies made with oat flour.

Cuisine

American

Prep time

10 minutes

Cooking time

12 minutes

Total time

22 minutes

Servings

24 cookies

Craving a cookie that’s deeply satisfying, wonderfully chewy, and made with wholesome ingredients? You’ve found it. These incredible oat flour peanut butter cookies are everything you want in a treat. They are naturally gluten-free and packed with rich, nutty flavor. Plus, they come together in one bowl in under 30 minutes. This recipe ditches regular flour for nutrient-rich oat flour, creating a soft, tender texture that’s simply irresistible. Whether you’re gluten-sensitive or just looking for a more nourishing cookie, this simple recipe is a game-changer.

Why You’ll Love These Oat Flour Peanut Butter Cookies

There are so many reasons to fall in love with this simple and delicious recipe. It’s bound to become a new favorite in your baking rotation.

  • Unbelievably Chewy Texture: Oat flour gives these cookies a soft, moist, and wonderfully chewy bite that sets them apart from traditional recipes.
  • * Rich, Nutty Flavor: The combination of creamy peanut butter and wholesome oat flour creates a deep, satisfying flavor that’s perfectly balanced.

  • Naturally Gluten-Free: With no all-purpose flour in sight, these cookies are perfect for anyone with gluten sensitivities.
  • One-Bowl Wonder: We love an easy recipe! All you need is one bowl, which means less time cleaning and more time enjoying your delicious cookies.
  • Wholesome Ingredients: Packed with the goodness of oats and peanut butter, these are cookies you can feel good about indulging in.

The Simple Ingredients You’ll Need

This recipe relies on a handful of pantry staples to create cookie perfection. Each ingredient plays a crucial role in achieving that perfect balance of flavor and texture.

A close-up of a single homemade oat flour peanut butter cookie, showing its soft and tender crumb.
You won't believe these delicious cookies are made with wholesome oat flour!
  • Oat Flour: The star of the show! It provides a tender texture and a subtle, nutty flavor. You can easily make your own or use a store-bought version.
  • Creamy Peanut Butter: Use a good quality, creamy peanut butter for the best results. Natural, drippy peanut butter works well here.
  • Brown Sugar: Adds moisture and a hint of caramel flavor, contributing to the chewiness.
  • Egg: Acts as a binder, holding all the ingredients together.
  • Unsalted Butter: Make sure it’s softened to room temperature for easy mixing.
  • Vanilla Extract: Enhances all the other flavors in the cookies.
  • Baking Soda: Helps the cookies rise just the right amount.
  • Salt: A pinch of salt balances the sweetness and brings out the nutty peanut butter flavor.

How to Make Oat Flour Peanut Butter Cookies Step-by-Step

Making these cookies is incredibly straightforward. Just follow these simple steps for a perfect batch every time.

  1. Preheat and Prep: Start by preheating your oven to 350°F (175°C). Line a large baking sheet with parchment paper to prevent sticking.
  2. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and brown sugar together with an electric mixer until light and fluffy.
  3. Add Wet Ingredients: Mix in the peanut butter, egg, and vanilla extract until everything is well combined and smooth.
  4. Combine Dry Ingredients: Add the oat flour, baking soda, and salt to the wet ingredients. Mix on low speed until just combined. Be careful not to overmix the dough.
  5. Scoop and Shape: Roll the dough into 1.5-inch balls and place them about 2 inches apart on your prepared baking sheet.
  6. Create the Criss-Cross Pattern: Gently press down on each dough ball with the tines of a fork, creating the classic peanut butter cookie criss-cross pattern.
  7. Bake to Perfection: Bake for 10-12 minutes, or until the edges are lightly golden brown. The centers will still look slightly soft.
  8. Cool and Enjoy: Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Tips for the Perfect Chewy Cookies

Want to guarantee the best possible cookies? Keep these expert tips in mind.

  • Don’t Overbake: For that perfect chewy center, pull the cookies from the oven when the edges are set but the middles still look a little underdone. They will continue to bake on the hot pan.
  • Use Room Temperature Ingredients: Softened butter and a room temperature egg will mix together more evenly, creating a better dough consistency.
  • Chill the Dough (Optional): If your dough feels too sticky, chilling it for 30 minutes can make it much easier to handle and can also lead to a thicker, chewier cookie.
  • Stick with Creamy Peanut Butter: For this recipe, avoid crunchy or natural peanut butter that requires a lot of stirring, as it can alter the texture.

Ingredient Substitutions & Variations

This recipe is wonderfully versatile. Feel free to experiment with these fun additions and substitutions.

  • Chocolate Chips: Fold in a cup of semisweet or dark chocolate chips for a classic flavor combination. Fans of our chocolate peanut butter marshmallow cookies will love this version.
  • Sweeteners: You can experiment with coconut sugar as a 1:1 replacement for brown sugar.
  • Vegan Option: To make these cookies vegan, use a flax egg and a plant-based butter substitute.

Making Homemade Oat Flour

Don’t have oat flour on hand? No problem! It’s incredibly easy to make your own at home.

  1. Choose Your Oats: Start with old-fashioned rolled oats for the best results.
  2. Blend: Add the oats to a high-speed blender.
  3. Process: Blend on high for about 30-60 seconds, or until the oats have turned into a fine, powdery flour. Stop to stir if needed to ensure everything is evenly blended.
  4. Measure: Measure the amount of flour you need for your recipe after blending. One cup of rolled oats yields roughly one cup of oat flour.

Making your own flour is a great way to ensure your cookies are as fresh as possible. For other unique cookie ideas, check out our dark chocolate orange shortbread cookies.

Storing Your Cookies

To keep your oat flour peanut butter cookies fresh and delicious, store them in an airtight container at room temperature. They will stay soft and chewy for up to 5 days. For longer storage, you can freeze the baked cookies for up to 3 months.

If you’re in the mood for another baked good that’s just as comforting, give our famous peanut butter cake a try!

Frequently Asked Questions

Yes, they are naturally gluten-free because the recipe uses oat flour instead of traditional wheat flour. To be certain, ensure you use certified gluten-free rolled oats if you are making your own flour.

Absolutely! To make your own oat flour, simply blend old-fashioned rolled oats in a high-speed blender until they reach a fine, powdery consistency. It’s a quick and easy way to make fresh flour for this recipe.

The key to chewy cookies is to not overbake them. Pull them from the oven when the edges are set and lightly golden, but the centers still look slightly soft. They will finish baking on the hot pan and set to the perfect chewy texture as they cool.

Store your oat flour peanut butter cookies in an airtight container at room temperature. They will stay fresh and chewy for up to 5 days. You can also freeze them for up to 3 months.

For the best texture, we recommend using a standard creamy peanut butter (like Jif or Skippy). Natural, oily peanut butters can sometimes cause the cookies to spread too much.

The Best Oat Flour Peanut Butter Cookies Recipe

A bright and airy flat lay of freshly baked chewy gluten-free peanut butter cookies made with oat flour.

Oat Flour Peanut Butter Cookies (Chewy & Gluten-Free)

The best oat flour peanut butter cookies recipe! These cookies are incredibly chewy, easy to make in one bowl, and naturally gluten-free. A wholesome and satisfying treat for any occasion.
Prep Time 10 minutes
Cook Time 12 minutes
Total Time 22 minutes
Servings: 24 cookies
Course: Dessert, Snack
Cuisine: American
Calories: 150

Ingredients
  

  • 1 cup oat flour store-bought or homemade
  • 1 cup creamy peanut butter
  • 1/2 cup unsalted butter softened
  • 3/4 cup brown sugar packed
  • 1 large egg room temperature
  • 1 tsp vanilla extract
  • 1/2 tsp baking soda
  • 1/4 tsp salt

Equipment

  • 1 Baking Sheets
  • 1 Mixing Bowl
  • 1 Electric mixer

Instructions
 

  1. Preheat your oven to 350°F (175°C) and line a large baking sheet with parchment paper.
  2. In a large mixing bowl, beat the softened butter and brown sugar together with an electric mixer until light and fluffy.
  3. Mix in the peanut butter, egg, and vanilla extract until well combined and smooth.
  4. Add the oat flour, baking soda, and salt. Mix on low speed until just combined. Do not overmix.
  5. Roll the dough into 1.5-inch balls and place them about 2 inches apart on the prepared baking sheet.
  6. Use a fork to gently press a criss-cross pattern onto the top of each cookie.
  7. Bake for 10-12 minutes, until the edges are lightly golden. The centers will still appear slightly soft.
  8. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Notes

Tip 1: For the chewiest texture, be careful not to overbake. The cookies will set further as they cool.
Tip 2: If dough is too sticky to roll, chill it in the refrigerator for 30 minutes.
Tip 3: Store cookies in an airtight container at room temperature for up to 5 days.

Share Your Creations!

We are so excited for you to try this recipe for the best oat flour peanut butter cookies! They are the perfect blend of wholesome and delicious. If you make them, please leave a comment below and let us know what you think. And don’t forget to share your beautiful cookie creations on Pinterest!

A stack of chewy oat flour peanut butter cookies with a glass of milk in the background. The cookies have a classic criss-cross pattern.
Get the recipe for the best oat flour peanut butter cookies - chewy, easy, and gluten-free!

A bright and airy flat lay of freshly baked chewy gluten-free peanut butter cookies made with oat flour.
The perfect texture - soft, chewy, and completely irresistible.

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