Mix Dry Ingredients. In a large bowl, whisk together the flour, cocoa powder, sugar, baking powder, and salt.
Combine Wet Ingredients. In another bowl, whisk together the milk, egg, melted butter, and vanilla extract.
Combine Wet and Dry. Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix; a few lumps are okay.
Fold in Chocolate Chips. If using, gently fold in the chocolate chips.
Preheat the Griddle. Heat a non-stick griddle or skillet over medium heat and lightly grease with butter or cooking spray.
Pour the Batter. For each pancake, pour about 1/4 cup of batter onto the griddle. Cook until bubbles form on the surface, then flip and cook until the other side is golden brown, about 2 minutes per side.
Plate and Serve. Serve your chocolate pancakes hot, with your favorite toppings such as maple syrup, whipped cream, or fresh berries.