Mix flour, chocolate chips, sugar, cocoa powder, baking powder, and salt together in a large bowl.

Combine milk, egg, butter, and vanilla in a small bowl. Pour over flour mixture; stir only enough to blend.

Heat a lightly oiled griddle over medium-high heat. Drop batter by large spoonfuls onto the griddle and cook until bubbles form and the edges are dry, 3 to 4 minutes. Flip and cook until browned on the other side, 2 to 3 minutes. Repeat with remaining batter.