In a stand mixer, beat the butter until light and fluffy, 1 minute.
1 Cup Unsalted Butter
Add the granulated sugar and brown sugar and beat 1-2 more minutes until fluffy.
1/2 Cup Granulated Sugar, 1 Cup Brown Sugar
Add 2/3 cup high quality chocolate chips or baking chocolate to a small bowl. Place the bowl over a saucepan of water simmering on the stove. Stir until it is getting smooth. Let it sit for 1 minute to cool just a little. Pour the chocolate into the batter. Beat the chocolate into the dough.
4 ounces Semi-Sweet Chocolate
Add eggs and vanilla and beat well, scraping the edges and bottom of the bowl.
2 Large Eggs, 3 teaspoons Vanilla Extract
Add the flour, cocoa, baking soda and salt to a bowl and whisk to combine. Beat the dry ingredients into the dough.
2 Cups All-Purpose Flour, 1 Cup Cocoa Powder, 1 teaspoon Baking Soda, 1/2 teaspoon Salt
Add the chocolate chips. You can use any combination, but we like semi-sweet and milk or semi-sweet and dark.
2 Cups Chocolate Chips
Cover the mixing bowl and put it in the freezer for 30 minutes to chill the dough. Take out the dough and using the America's Test Kitchen way, scoop 1/4 cup, break the dough ball in half and stack the two pieces on top of each other. Place the shaped cookies onto a plate, cover with plastic wrap and refrigerate 30 minutes.
Once the dough has chilled, heat the oven to 375 degrees F.
Bake for 10-11 minutes. DO NOT over bake.
Cool for at least 5 minutes before removing to a cooling rack as the cookies will take a minute to set up.