Mix the Dry Ingredients: In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt. Break up any cocoa lumps so the mixture is evenly combined.
Combine the Wet Ingredients: In a separate bowl, whisk the egg, milk, melted butter, and vanilla extract until smooth. Allow the melted butter to cool slightly before mixing it with the other ingredients.
Prepare the Batter: Pour the wet mixture into the dry ingredients. Stir gently with a whisk or spatula until just combined. A few small lumps are fine, so avoid overmixing, which can make the pancakes dense.
Add the Chocolate Chips: Fold the chocolate chips into the batter, distributing them evenly. Reserve a few chips to sprinkle over the pancakes while cooking, if desired.
Heat the Skillet: Place a nonstick skillet or griddle over medium-low heat. Lightly grease the surface with butter or oil. Let the pan heat evenly before adding the batter.
Cook the Pancakes: Pour approximately 1/4 cup of batter onto the hot skillet for each pancake. Cook for 2–3 minutes, until bubbles appear on the surface and the edges begin to look set.
Flip and Finish: Carefully flip each pancake with a spatula and cook for another 1–2 minutes, until the second side is cooked through. Reduce the heat if the outside browns too quickly before the center is done.
Add Toppings and Serve: Transfer the pancakes to serving plates. Top with whipped cream, mini marshmallows, chocolate sauce, or chocolate shavings, and serve warm.