Step 1

Preheat oven to 400 degrees. In a large mixing bowl, add cubed butter, sugar, and brown sugar. Cream together for 4 minutes or until light and fluffy, scraping the sides of the bowl halfway through.

Step 2

Add egg, egg yolk, lemon zest, lemon juice, and lemon extract (if using). For extra lemon flavor, add more lemon zest.

Step 3

Fold in flour, cornstarch, baking soda, and salt just until combined. Fold in lemon flavored chips or white chocolate chips.

Step 4

Roll into 6-ounce balls. I suggest weighing the cookie dough with a food scale to ensure even baking. Place on a light colored baking sheet. It is important to use a lighter colored baking sheet or the bottoms may become too browned.

Step 5

Bake for 9-11 minutes. After baking, let set-up for at least 10 minutes.