Oatmeal Raisin Walnut Cookies are soft, lightly spiced, and incredibly easy to customize. They bake up chewy and tender, with texture from oats and toasted walnuts.
Preheat the oven to 350 degrees Fahrenheit (177 degrees Celsius). Line two baking sheets with parchment paper or a Silpat mat, and set aside.
In the bowl of a stand mixer, beat together the butter, brown sugar, and vanilla for 3–4 minutes on medium-high. Add the egg and mix, then add the egg yolk, mixing for an additional minute on medium-high.
In a medium-sized mixing bowl, combine the flour, oats, baking soda, salt, cinnamon, and nutmeg. Whisk to combine. With the mixing speed on low, gradually add the dry ingredients, mixing until no flour pockets remain. Remove the bowl from the stand and fold in the raisins and walnuts. Allow the cookie dough to chill in the refrigerator for 2 hours before baking.
Scoop the chilled dough onto the prepared cookie sheets. Gently pat down each ball. Place in the oven and bake for 10–12 minutes, or until the edges of the cookies begin to turn golden brown. The centers should look slightly underbaked; they will firm up once cooled. Remove from the oven and allow the cookies to cool on the sheets for 3–4 minutes before transferring to a wire rack to cool completely.
Notes
STORE Raisin Walnut Oatmeal Cookies in an airtight container at room temperature for up to 5 days. To keep them soft, you can add a slice of bread or a piece of apple to the container.For longer storage, FREEZE the cookies in a zip-top freezer bag or airtight container for up to 3 months—place parchment between layers to prevent sticking. To thaw, place the cookies in the refrigerator and let them sit overnight. REHEAT in the microwave for 10–15 seconds if you’d like them soft, warm, and fresh-tasting again.