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    Home » Nuts and Starches

    Rich and Chewy Black Walnut Cookies (with Oatmeal Flour)

    Published: Sep 14, 2024 Modified: Mar 29, 2025 Author: Alan Bergo

    Jump to Recipe Jump to Video

    Crisp on the edges, chewy on the inside, these black walnut cookies aren't your average cookie. They're somewhere along the line of amaretti with a soft, chewy center, but are really they're own thing entirely. It took me nine pounds of walnuts to develop the recipe, but it was worth it. After your first bite you'll know why.

    Black walnut cookies tinted by adding ground fruit powder to the dough on a plate next to a cup of tea.
    Black walnut cookies tinted by adding ground fruit powder to the dough.

    I wanted to make a small bite to serve after larger meals or groups of people that packed a big black walnut flavor. While I call them cookies, you could also get away calling them power bars, walnut bombs, or even amaretti. They're gluten free, rich as all get-out, and, as black walnuts have more protein than any nut, you can say they're a health food!

    Black walnut cookies on a plate ready to serve.
    Black walnut cookies made with only oat flour will be blonde/light golden.

    I've been testing versions of the recipe at a few different events. People have been begging for the recipe so I think it's been worth the time it took to perfect them. The best part is that you could use just about any nut, but fatty nuts like walnuts, butternuts and shagbark hickory nuts will be the best.

    How to Make This Black Walnut Cookie Recipe

    First the walnuts are ground as fine as possible in a spice grinder or coffee grinder. It's important to work in small batches around two tablespoons at a time. It's ok if there's some chunks.

    Grinding black walnuts to flour in a spice grinder.
    Grinding black walnuts to flour in a spice grinder.

    Next the walnut flour is mixed with ground oats, cinnamon, one whole egg, salt, and lemon zest. Made as-is the color will be a light blonde. To enhance the color and be creative, you can add dried fruit powder like dried mulberries, serviceberries, aronia berries, cocoa powder or even buckwheat flour in a pinch.

    Black walnut flour, eggs, sugar, cinnamon and salt in a mixing bowl.
    1 large egg, walnut flour, sugar, salt, cinnamon, oat flour and serviceberry powder.
    Adding grated lemon zest to a batch of black walnut cookies.
    Adding lemon zest to the cookie dough.

    All the ingredients are mixed into a thick, sticky dough. From here the dough can be made ahead of time and refrigerated or frozen.

    Mixing black walnut cookie dough in a bowl with a spoon.
    Mixing the cookie dough into a soft, sticky batter.

    When it's time to cook, the dough is pressed into a brownie bite mold or small cookie mold. Although I don't often use recipes that call for specific equipment, I haven't had success baking the cookies without a mold as the fat content of the walnuts makes them spread out into a thin disk. I recommend using the exact mold pictured in this post that I've linked in the equipment section of the recipe.

    Pressing down black walnut cookie dough into a silicone baking mold.
    Pressing down black walnut cookie dough into a silicone baking mold.

    Before baking, lightly toasted walnuts are pressed into the top of each cookie to give them an attractive look.

    Pressing black walnuts into the top of cookies in a mold.
    Pressing walnuts into each cookie before baking.

    The cookies need to cool completely before unmolding in order to set. Once they're cool, they'll keep at room temperature for a week, but none of my batches have lasted that long.

    removing black walnut cookies from a silicone baking mold after cooking.
    Unmolding cookies after they're cooled and set.

    Tips and Variations

    • For a touch of caramel flavor you could use coarsely chopped salted candied black walnuts to garnish the top of the cookies.
    • Dried chokecherries ground to a flour and sifted to remove shell fragments will add an almond flavor and color. Start with 2-3 tablespoons substituted for the oat flour. See my post on Bird Cherry Cake for more on cherry flour.
    • This recipe can be made with just about any nut, or a combination.
    • Dried spicebush berries (¼ teaspoon per batch) will add a white pepper and allspice flavor.
    • Instead of fruit powder, you can color the cookies with 2 tablespoons of dark cocoa powder.

    Related Posts

    • Black Walnut Ice Cream
    • Black Walnut Milk
    • Nocino, the Black Walnut Liqueur
    Print Recipe Pin Recipe
    5 from 5 votes

    Rich and Chewy Black Walnut Cookies with Oatmeal (GF)

    Chewy, rich black walnut cookies perfect for serving with coffee or tea, taking on a hike, or eating all by themselves. Many different nuts or nut flours can be substituted.
    Prep Time5 minutes mins
    Cook Time20 minutes mins
    Total Time25 minutes mins
    Course: Dessert, Snack
    Cuisine: American
    Keyword: black walnut cookie oatmeal, black walnut cookie recipe
    Servings: 20 servings
    Calories: 88kcal
    Author: Alan Bergo
    Cost: 5

    Equipment

    • Square silicone cookie mold, 1 oz size
    • Spice grinder or coffee grinder
    • Measuring cups and measuring spoons
    • 2 quart mixing bowl
    • Two clean soup spoons for portioning cookies (optional)

    Ingredients

    • 7 oz (200 grams) black walnuts for the dough roughly 2 cups of Hammonds recipe ready black walnuts plus an extra 20 grams or roughly two tablespoons to garnish.
    • ½ cup (4oz) organic sugar or maple sugar
    • ½ teaspoon ground cinnamon
    • 4 tablespoons (1.3 oz) rolled oats all purpose flour, or gluten free flour
    • ½ teaspoon flaky salt such as Maldon or just diamond kosher
    • Zest of half a lemon or a Meyer lemon
    • 1 large egg

    Instructions

    • Lightly toast the ¼ cup of black walnuts for garnishing in a pan until golden and reserve.
    • Pulse the sugar a few times in the spice grinder-it should still be coarse.
    • Working in small batches around 2 tablespoons at a time, grind the black walnuts as fine as possible in a spice grinder. It’s fine if the flour is a little chunky.
    • A great tip is to use chopsticks to clean the spice grinder between batches.
    • If a spice grinder seems difficult you can mix the walnuts and sugar and grind in a food processor.
    • Grind the oats to a fine flour in the spice grinder.
    • Mix the oat flour, sugar, cinnamon, and salt.
    • Put the ground walnuts, oat flour mixture and egg in a bowl. Grate the lemon zest onto the mixture, then stir until thoroughly combined.
    • Lightly oil the cookie mold.
    • Pack 20 gram chunks of dough (generous tablespoons) into the cookie mold, top with a sprinkle of toasted black walnuts, pressing them down into the mold. The dough will be sticky, so you can use two spoons to form it if needed. Chill the mold for 10 minutes in the refrigerator.
    • Preheat the oven to 350 F.
    • Put the cookie mold into the oven and cook for 22 minutes, rotating the mold half-way through cooking. Remove the cookies and allow to cool for 10 minutes before attempting to unmold.
    • They should be light golden on the edges and slightly crisp, but still tender and chewy on the inside. Store the cookies in an air tight container at room temperature and they’ll last for a week.

    Video

    Notes

    The cooking time of 22 minutes may sound odd here. Just over 20 minutes seems to be the sweet spot. If you unmold the cookies and they seem a little soft, you can gently toast them in a 300F oven on a baking sheet lined with parchment for a few minutes, after cooling they will firm up a bit. 
    Sometimes I add 1-2 tablespoons cocoa powder or buckwheat flour for color. 

    Nutrition

    Serving: 2Cookies | Calories: 88kcal | Carbohydrates: 7g | Protein: 3g | Fat: 6g | Saturated Fat: 0.4g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 2g | Sodium: 0.4mg | Potassium: 59mg | Fiber: 1g | Sugar: 5g | Vitamin A: 4IU | Vitamin C: 0.2mg | Calcium: 8mg | Iron: 0.4mg
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    Reader Interactions

    Comments

    1. LaRae

      September 22, 2024 at 12:51 pm

      5 stars
      Spectacular chewy goodness!

      Reply
      • Alan Bergo

        September 22, 2024 at 12:56 pm

        You got to try some of the first few batches. I’m making more this week. 🙂

        Reply
    2. Lorenzo

      September 19, 2024 at 2:50 pm

      5 stars
      These cookies are by far the best way I’ve had Black Walnuts prepared. I’ve had the pleasure of tasting these cooked by the man himself, and they are as good as they look. I’m thankful for Alan paving the way for wild food cookery 🤙

      Reply
      • Alan Bergo

        September 19, 2024 at 4:47 pm

        Thanks buddy. It was fun to bring them to our event.

        Reply
    3. Sheila

      September 19, 2024 at 11:44 am

      5 stars
      Fyi for anyone else like me with no mold and no patience to wait for one before trying these...I used mini paper baking cups that I already had on hand and these came out perfectly delicious. I just filled the cups, set them on a sheet tray to bake and pulled them about 2 minutes early.
      They are so good and adaptable that now I'm gonna buy the mold...they'll definitely be a staple.
      Thanks so much for another inspired recipe!

      Reply
      • Alan Bergo

        September 19, 2024 at 4:48 pm

        Hey thanks Sheila I’m glad they worked out. Thanks for sharing!

        Reply
      • Lisa Lyle

        September 24, 2024 at 12:50 pm

        5 stars
        I just made these last night and wow!!!! I also added some rum flavoring and topped them with dark chocolate and dehydrated wild blueberries. Making more now!!! Thank you for your wonderful site.

        Reply
        • Alan Bergo

          September 24, 2024 at 12:58 pm

          Hey thanks Lisa. It was frustrating going through so many nuts to get them right, but hearing how much people are enjoying them makes it worth it. Thanks for commenting.

          Reply
    4. Linh

      September 15, 2024 at 10:56 am

      Did you happen to try baking them in a square pan and then cutting them into smaller pieces like brownies?

      Reply
      • Alan Bergo

        September 15, 2024 at 1:21 pm

        Hi Linh. It might work, but the edge-to-edge chewy texture is really good. I don’t think I’ve ever posted a recipe that requires a specific mold, but it’s been the most efficient way I’ve found to make them. The batter is tricky to deal with fresh.

        Reply
    5. Sandy

      September 14, 2024 at 1:41 pm

      5 stars
      Delicious!

      Reply
      • Alan Bergo

        September 14, 2024 at 1:57 pm

        Hey thanks Sandy. You’ve tried a lot of them!

        Reply
    6. Danica

      September 14, 2024 at 11:15 am

      Your recipe calls for maple sugar, if I used just maple syrup would this make it a hard cookie and, why couldn't I use just maple syrup?

      Reply
      • Alan Bergo

        September 14, 2024 at 1:54 pm

        The additional water from maple syrup would make the cookies very hard. You can use white sugar too.

        Reply
    7. Ruth C

      September 14, 2024 at 7:04 am

      Do you have any tips for harvesting black walnuts? They are everywhere but I don’t know when to harvest, when to peel off outer shell and how to crack them open. I can never crack them open. Thanks.

      Reply
      • Alan Bergo

        September 14, 2024 at 1:56 pm

        Hi Ruth. I have an entire post dedicated to this. See my guide to black walnuts.

        Reply
    8. Brenna

      September 14, 2024 at 6:57 am

      This looks delicious! I have just dehydrated a bunch of spicebush berries and was wondering what other uses I could fund for them. Should I grind then with the seed or without in order to add them to the recipe? Would you add any other fruit or cocoa with them or just by themselves for this recipe?

      (P S. I used your nocino recipe last year and it was a hit at Christmas! I missed collecting the young nuts this year and remembered only after they had gotten too firm.)

      Reply
      • Alan Bergo

        September 16, 2024 at 3:59 pm

        Hi Brenna. I grind my spicebush whole. They're very powerful so just use a tiny pinch, taste a tiny piece of the batter before cooking to test the seasoning.

        Reply
    5 from 5 votes

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    Chef Alan Bergo

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