Preheat the oven to 350F and line a baking sheet with parchment paper.
In a small bowl stir together cocoa powder, all purpose flour, baking powder, salt and espresso powder. Set aside.
In a large bowl whisk together melted butter, brown sugar & white sugar until combined. Then whisk in egg, oil and vanilla extract until fully incorporated.
To the wet ingredients add the dry ingredients, stirring until combined & a cookie dough forms. Lastly, fold in the chocolate chips.
Scoop out about 2 tablespoonfuls of cookie dough per cookie & drop on the prepared baking sheet, spacing the dough about 2 inches apart. You will get about 14-16 cookies.
Bake for 10-12 minutes until edges are set & the middle is still a bit gooey. Cool the cookies for 5 minutes on the baking sheet before moving to a cooling rack.
Notes
These cookies freeze well for up to a 1 month. To defrost remove cookie from freezer and let come to room temperature.