Preheat oven to 350 degrees F. Whisk together flour, cocoa powder, baking soda and salt; set aside.
In a large bowl, beat cooled coconut oil, brown sugar, egg, vanilla, and espresso powder (if using) until creamy and smooth; about 1-2 minutes.
Add in flour mixture and incorporate until well combined. Fold in chocolate chips.
Roll into small dough balls or use a small cookie scoop to drop on a baking sheet and flatten slightly with the palm of your hand.
Bake 8-10 minutes. I like to take mine out at 9 minutes so they remain soft. Sprinkle with sea salt immediately.
Cool on cookie sheet for a few minutes then transfer to wire rack to finish cooling.
