Step 1

Preheat oven to 385 degrees. In a large mixing bowl, cream together the cubed butter, brown sugar, and sugar for 4 minutes, until light and creamy. Scrape the sides of the bowl to ensure even mixing.

Step 2

Add in eggs, one at a time, and then vanilla, and mix until creamy.

Step 3

Fold in flour, rolled oats, cornstarch, baking soda, and salt and mix just until combined. Do not overmix or it will create too much gluten in the cookies.

Step 4

Fold in chocolate chips. Roll into 4-ounce, 5-ounce, or 6-ounce balls.

Step 5

Place on a light colored baking sheet. Bake for 8-10 minutes or just until the edges start to turn a light golden color and the centers are slightly underdone.

Step 6

Optional: as soon as you remove the cookies from the oven, lightly press extra chocolate chips on top of the cookies to make them look more gourmet.