In a large bowl, mix together vegetable oil, eggs, vanilla extract, salt, 1 cup sugar, and expresso powder. Sift the cocoa powder and mix it in as well.
Add the all-purpose flour, cornstarch, baking powder, and baking soda. Mix until the dough just comes together. Cover and chill for at least 2 hours.
Preheat the oven to 350° Fahrenheit.
Using a tablespoon make balls that are approximately 1 ½ tablespoon big. Roll each ball in sugar and then roll in powdered sugar.
Place balls on baking trays about 1 to 2 inches apart. Bake for 10 to 12 minutes. Let cool for 5 minutes on the baking sheet and then transfer to a baking rack to cool completely.
Enjoy!!
Notes
Cookie dough can be chilled for up to three days. If freezing, do not roll in sugar. Only roll in sugar right before baking the cookies.