In a mixing bowl combine the flour, salt, espresso powder, chocolate, and baking powder. Whisk until combined.
In the bowl of a stand mixer add the oil and sugars, mix on medium-high. Add the eggs one at a time. Add the vanilla and scrape the sides as necessary.
Reduce the speed to low and add the flour mixture and mix until just combined. Pour into the mixing bowl and cover. Refrigerate for at least 4 hours or overnight. The dough is good in the refrigerator for up to 24 hours.
Preheat the oven to 350°F, 177°C, or gas mark 4.
Using the cookie scoop roll the dough into a ball and coat in the powdered sugar. Place on the lined sheet pan with a 2 inch space between each cookie. Bake for 12 minutes. Swap the racks halfway through baking.
Allow for the cookies to set a few minutes before transferring to a cookie rack. Repeat as many times as necessary until you run out of dough, allowing the sheet pan to cool completely before baking again.
Notes
The dough can be frozen for up to 4 weeks.
While my photo shows 12 cookies on a sheet pan you can fit 15 without any of them spreading into each other.
Not all of the powdered sugar will be used.
If using the 1 tablespoon scoop double the number of cookies expected.