Preheat oven to 300°F. Cream the butter, sugar and brown sugar in the bowl of a stand mixer on medium speed fitted with the paddle (or flat beater) attachment for about 2 minutes. Add the eggs, one at a time, vanilla and lemon juice, blending with mixer on low speed for 30 seconds, then turn up to medium speed for about 2 minutes, or until light and fluffy, scraping down bowl with a rubber spatula.With mixer on low speed, add the flour, oats, baking soda, salt and cinnamon, blending for about 45 seconds. Don’t overmix.
Remove bowl from mixer and stir in chocolate chips and walnuts. Alternatively, let the stand mixer mix everything for you. Portion cookie dough with a scoop (about 3 tablespoons) onto a baking sheet lined with parchment paper about 2 inches apart. Bake cookies for about 20 to 23 minutes, or until edges are golden brown and center is still soft.
Remove from oven and cool on baking sheet for about 1 hour. . . if you can wait that long! Enjoy!
Baker's Note:You can freeze the remaining cookie dough balls, and there’s no need to thaw. Preheat oven to 300°F and place frozen cookies on parchment paper-lined baking sheet about 2 inches apart. Bake for about 27 to 30 minutes, or until edges are golden brown and center is still soft.
Notes
*If you want to get very technical and scientific, a pinch is generally defined as 1/16 teaspoon. While there's some debate about this, The New Food Lover's Companion considers a pinch to be 1/16 tsp, while a dash is “somewhere between 1/16 and a scant 1/8 teaspoon.”**I only used 1 cup and used chopped pecans ***I only added about 2 cups and used a blend of bittersweet, semi-sweet and milk chocolate chips