01 - Whisk together flour, sugar, baking powder, baking soda, salt, and cinnamon in a large bowl until evenly distributed.
02 - Whisk milk, eggs, melted butter, and vanilla extract in a separate bowl until fully incorporated.
03 - Pour wet ingredients into dry ingredients and stir until just combined. Avoid overmixing; small lumps are acceptable. Let batter rest for 5 minutes.
04 - Preheat a non-stick skillet or griddle over medium heat. Lightly grease with additional butter.
05 - Pour 1/4 cup batter per pancake onto the griddle. Cook until bubbles form on the surface and edges appear set, approximately 2-3 minutes. Flip and cook until golden brown, an additional 2-3 minutes.
06 - Combine 1/4 cup sugar and 2 teaspoons cinnamon in a small bowl. Mix until uniform in color.
07 - Brush warm pancakes lightly with melted butter, then generously dust both sides with the cinnamon sugar mixture.
08 - Place chopped chocolate and cream in a microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until completely smooth and glossy.
09 - Stack coated pancakes on serving plates. Drizzle warm chocolate sauce over the top or serve alongside for dipping.