Preheat oven: Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
Combine dry ingredients: In a medium bowl, whisk together flour, oats, baking soda, and salt.
Cream butter and sugars: In a large bowl, cream together butter and sugars until light and fluffy.
Beat in egg and vanilla: Beat in egg and vanilla extract until well combined.
Combine wet and dry ingredients: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Stir in walnuts: Stir in chopped walnuts.
Shape cookies: Drop by rounded tablespoons onto prepared baking sheets.
Bake: Bake for 10-12 minutes, or until lightly golden brown.
Cool: Let cookies cool on baking sheets for a few minutes before transferring to a wire rack to cool completely.
Tips & Variations:
Make-ahead: You can chill the dough for 30 minutes before baking for a slightly thicker cookie.
Add-ins: Get creative with add-ins! Try dried cranberries, raisins, chocolate chips, or chopped nuts like pecans or almonds.
Spice it up: Add a touch of cinnamon, ginger, or nutmeg to the dough for extra flavor.
Enjoy these delicious and healthy oatmeal walnut cookies!
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