Preheat oven to 350°F/180°C, 160°C fan oven, line a baking sheet with parchment paper or a silpat silicone mat and set aside
In a medium bowl, stir together the flour, espresso powder, baking soda and salt, set aside
In a separate bowl, cream together the butter, brown sugar and granulated sugar until light and fluffy
Add in the eggs and vanilla extract and mix well. Add the flour mixture in 2-3 smaller additions, mixing well after each.
Stir in the chocolate chips until evenly distributed
Using a medium cookie scoop (1 ½ inch scoop or #40), drop dough onto the prepared cookie sheets 2 inches apart. onto the prepared cookie sheets 2 inches apart
Bake in the preheated oven for 7-9 minutes, until cookies have spread and are no longer glossy on top; sprinkle with salt if using and allow them to cool 5 minutes before transferring to a wire rack and cooling completely
Notes
Line your baking sheet with parchment paper or a silicone baking mat to keep the cookies from sticking, and make cleanup super easy.
I highly suggest that you use a cookie scoop to make this recipe, but if you don't have one, each ball of dough should be about 1.5 tablespoons.
To make the cookies look beautiful, add a few extra chocolate chips to the balls of dough before baking. The extra chips will stay visible on the top of the cookies rather than being baked in.
Don't overbake these! You want the cookies to be crisp on the edges but still a bit chewy in the middle. Remove them from the oven when they no longer look wet and glossy on top.
To Store: Keep leftover cookies in an airtight container at room temperature for 5 days, or freeze for up to 1 month.