In a mixing bowl, whisk egg, milk, oil, and vanilla until well combined.
On top of wet ingredients, add flour, cocoa powder, espresso powder, sugar, baking powder, and salt. Toss together lightly before stirring into wet ingredients. Mix only until just combined, do not overmix.
Heat a griddle over medium heat. If desired, grease with butter, oil, or nonstick cooking spray.
Add batter by about 1/4 cup scoops.
Cook for 3-4 minutes or until bubbles appear and don’t disappear.
Flip and cook for another 3-4 minutes or until golden brown and cooked through.