In a stand mixer or large bowl with a hand mixer, combine 1 cup room temperature Butter, 1/2 cup Granulated Sugar, and 1 cup Brown Sugar. Mix until it's beginning to look smooth and creamy, about 1- 2 minutes.
Add 1 Egg, 1 Egg Yolk, and 2 tsps of Vanilla Extract. Mix on medium speed for 5-7 minutes to fully cream the butter. Scraping down the sides as needed.
While butter is creaming: In a large bowl, combine 2 cups All-Purpose Flour, 1 tsp Baking Soda, 1 tsp of Baking Powder, 2 tbsps of Milk Powder and 2 tsp Salt. Sift together with a butter knife or fork.
Once butter mixture is looking creamy and smooth and all ingredients are fully incorporated, gradually beat in the flour mixture until dough forms. Scraping down the sides as needed.
Hand mix in 2 cups of Semi-Sweet Chocolate Chips until evenly distributed throughout the dough.
Cover bowl with plastic wrap and chill in the refrigerator for 1 hour.
Towards the end of the chilling time, preheat oven to 350 degrees Fahrenheit.
Scoop 1 tablespoon rounded dough onto parchment paper lined or silicon mat lined baking sheets. Only putting 6 cookies per sheet so they have adequate space to spread out and not run in to each other.
Bake one sheet at a time for 12 minutes or until barely golden brown and edges are set. Do not overcook, this will be imperative to have soft cookies. Allow cookies to stay on sheet for 3-5 minutes after coming out of the oven before moving to wire rack to cool.
Enjoy!