01 - Sift together flour, granulated sugar, baking powder, baking soda, salt, and ground cinnamon in a large mixing bowl.
02 - Whisk whole milk, eggs, melted unsalted butter, and vanilla extract in a separate bowl until fully incorporated.
03 - Pour wet mixture into dry ingredients and fold gently until just combined. Avoid overmixing to maintain texture. Allow batter to rest for 5 minutes.
04 - Preheat a non-stick skillet or griddle over medium heat. Lightly coat surface with butter to prevent sticking.
05 - Portion 1/4 cup batter per pancake onto prepared griddle. Cook until surface bubbles form and edges set, approximately 2–3 minutes. Flip and cook until golden brown on second side, another 2–3 minutes.
06 - Combine granulated sugar and ground cinnamon in a small bowl, mixing thoroughly until uniform.
07 - Brush warm pancakes lightly with melted butter if desired. Generously dust both sides with cinnamon sugar mixture while still warm.
08 - Place chopped dark chocolate and heavy cream in a microwave-safe bowl. Heat in 20-second intervals, stirring between each, until completely melted and glossy.
09 - Stack coated pancakes on serving plates. Drizzle warm chocolate sauce generously over top or serve alongside for dipping.