The coconut oil in these cookies is the secret ingredient. It's just subtle enough that people will want to know what that delicious flavor is. They are best eaten within a day or two--although they won't last that long!
Preheat the oven to 350 degrees F; line three baking sheets with parchment paper and lightly coat with cooking spray. Combine the flour, cocoa powder and salt in a small bowl and set aside.
Combine the sugar, vegetable oil, coconut oil, milk, vanilla and egg white in a medium bowl and beat with a hand mixer on medium-high speed until smooth, about 1 minute. Add the flour mixture and beat on low speed until incorporated.
Drop teaspoonfuls of the batter about 2 inches apart on the prepared baking sheets. Bake until the cookies look firm and dry on the top, 10 to 12 minutes. Let cool on the baking sheets for a few minutes, and then transfer to a rack to cool completely.