In a large bowl, whisk the flour, cocoa powder, sugar, baking powder, and salt together.

In a medium bowl, whisk the milk, eggs, vegetable oil, and vanilla extract together.

Pour the wet ingredients into the dry ingredients and use a spatula to mix until the batter is just combined. Gently fold in the chocolate chips.

Heat a large skillet or griddle over medium heat. Grease the pan with nonstick spray.

Pour the batter into the skillet using a ¼-cup measuring cup. Cook for about 1 minute on each side, until browned. Transfer the cooked pancakes to a plate and wrap with foil. Repeat with the remaining batter.

Make the chocolate sauce. Place the chocolate chips in a microwave-safe bowl. Microwave the chocolate chips in 30-second increments, stirring in between each, until completely melted.

Pour the heavy cream into the melted chocolate and whisk until the sauce is silky and smooth.

Serve the pancakes with chocolate sauce and a sprinkle of chocolate chips.