Prep the oats: Toss your oats into a food processor and pulse until they’re semi-fine or almost like flour. This gives your cookies that signature texture without being gritty.

Mix the dry ingredients: In a small bowl, combine the pulsed oats, flour, baking soda, salt, and cinnamon. Give it a good stir with a spatula or wooden spoon until everything’s evenly blended.

Cream the butter and sugars: In a medium bowl, add the softened butter and both sugars. Grab your electric hand mixer and cream them together until fluffy and dreamy. Then stir in the vanilla, lemon juice, and eggs until the mixture is silky smooth. Don’t forget to scrape the bottom of the bowl once or twice—cookies hide there sometimes!

Bring it together: Slowly fold the dry ingredients into the wet ingredients with a spatula. Take your time and resist overmixing—you want soft, chewy cookies, not cakey ones. Toss in the chocolate chips and walnuts (if using) and fold until evenly distributed.

Chill out: Using a large cookie scoop (about 3 tablespoons) or a medium one for smaller cookies, scoop the dough onto a lined baking sheet. Pop the tray in the fridge or freezer for at least 2–4 hours, or even overnight if you’re planning ahead. This step is the secret to that perfect chewy texture!

Bake time: Heat your oven to 350°F. Space the chilled dough 1½–2 inches apart on a parchment-lined or Silpat-lined baking sheet. Bake for 13–14 minutes (12–13 for smaller cookies) until the edges are set and the centers still look soft—they’ll finish cooking on the tray.

Cool and store: Let the cookies cool completely on a wire rack. Store in an airtight container.