Instructions

1. Preheat oven to 410 degrees.
2. In a large mixing bowl, cream together cold cubed butter, brown sugar, and sugar for 4 minutes or until creamy.
3. Add eggs, one at a time, mixing well after each one.
4. Mix in flour, cornstarch, cocoa powder, baking soda, coffee powder, and salt. Mix until just combined to avoid overmixing. Stir in chopped Heath bars.
5. Separate dough into large balls and place on lightly colored cookie sheet. You can make these giant, as Levain does, or a more modest size if you don’t want mega-cookies.
6. Bake for 9-12 minutes or until golden brown on the top. (It’s about the same baking time no matter how large you make your cookies, but if they’re small, check after 8 minutes, and if they’re giant, 10 is probably a good checking point.)
7. Let them rest for at least 10 minutes to set.