In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt until well combined.

In a separate bowl, mix the milk, egg, vegetable oil, and vanilla extract until smooth.

Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix; it's okay if there are a few lumps. If using, gently fold in the chocolate chips.

Preheat a non-stick skillet or griddle over medium heat. Lightly grease with cooking spray or a small amount of oil.

Pour 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface, about 2-3 minutes. Flip and cook for an additional 1-2 minutes, or until cooked through.

Repeat with the remaining batter, adjusting the heat as necessary to prevent burning.

Serve warm with your favorite toppings such as maple syrup, whipped cream, or fresh fruit.