In a large mixing bowl, cream together 1 cup of softened butter and 1 cup of sugar using a hand mixer or stand mixer on medium speed. Beat until light and fluffy, about 3-5 minutes.

Gradually add 2 cups of all-purpose flour into the creamed mixture, mixing on low speed to avoid flour clouds.

Gently fold in 1 cup of chocolate chips, 1/2 cup of nuts, and 1 cup of oats.

Using a cookie scoop or tablespoon, drop rounded spoonfuls of dough onto a prepared baking sheet lined with parchment paper, spacing them about 2 inches apart.

Preheat your oven to 350°F (175°C). Bake for 10-12 minutes, until the edges are firm.

Once baked, remove from the oven and let cool on the baking sheet for 5 minutes before transferring to a wire rack.