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Preheat the oven to 350°F (175°C).

In a large bowl or stand mixer, cream together the softened butter, brown sugar, and granulated sugar until the mixture is smooth and creamy.

Add the 2 large eggs, 2 large egg yolks, and 2 tablespoons of vanilla extract. Mix until these ingredients are fully combined into the butter and sugar mixture.

Add the 4 cups of all-purpose flour, 2 cups of old-fashioned oats, 2 teaspoons of baking soda, 2 teaspoons of baking powder, and 1 1/2 teaspoons of salt to the mixture. Mix just until these dry ingredients are incorporated into the dough.

Fold in the 3 cups of chocolate chips.

Using a large cookie scoop (approximately 3 tablespoons per cookie), scoop the dough and place it onto a baking sheet lined with parchment paper, ensuring even spacing between cookies.

Bake the cookies for 11 minutes. The cookies will appear slightly underbaked in the center when removed from the oven; this is intended to keep them soft.

Allow the cookies to cool on the baking sheet for a few minutes before carefully transferring them to a wire rack to cool completely.


Preheat the oven to 350°F (175°C).

In a large bowl or stand mixer, cream together the softened butter, brown sugar, and granulated sugar until the mixture is smooth and creamy.

Add the 2 large eggs, 2 large egg yolks, and 2 tablespoons of vanilla extract. Mix until these ingredients are fully combined into the butter and sugar mixture.

Add the 4 cups of all-purpose flour, 2 cups of old-fashioned oats, 2 teaspoons of baking soda, 2 teaspoons of baking powder, and 1 1/2 teaspoons of salt to the mixture. Mix just until these dry ingredients are incorporated into the dough.

Fold in the 3 cups of chocolate chips.

Using a large cookie scoop (approximately 3 tablespoons per cookie), scoop the dough and place it onto a baking sheet lined with parchment paper, ensuring even spacing between cookies.

Bake the cookies for 11 minutes. The cookies will appear slightly underbaked in the center when removed from the oven; this is intended to keep them soft.

Allow the cookies to cool on the baking sheet for a few minutes before carefully transferring them to a wire rack to cool completely.
