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Preheat the oven to 350 degrees F. Line two large baking sheets with parchment paper and set off to the side for later.
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In a medium mixing bowl whisk together the flour, baking soda, and salt. Set off to the side.
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In the bowl of an electric stand mixer fitted with the paddle attachment, cream butter and sugars at medium speed, for three minutes until light and fluffy.
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Scrape down the sides, add vanilla, and mix another minute until combined.
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Add one egg at a time, mixing for a minute in between. Scrape down the sides as needed.
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Add the flour mixture all at once. Mix on low speed until just about combined. Add oats, walnuts, and chocolate. Mix until combined.
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Scoop out ¼ cup portions of dough on to the parchment. Place each portion of dough approximately 1 ½ inches apart. Continue until each sheet is full.
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Bake cookies for 18-20 minutes. Let cookies cool for five minutes on the baking sheet before transferring to a wire rack. Continue baking process until all the dough is used.