01 - Whisk together flour, granulated sugar, baking powder, baking soda, salt, and ground cinnamon in a large mixing bowl until evenly distributed.
02 - In a separate bowl, whisk whole milk, eggs, melted butter, and vanilla extract until fully blended and smooth.
03 - Pour wet mixture into dry ingredients and stir gently until just combined. Small lumps are acceptable. Allow batter to rest for 5 minutes to thicken slightly.
04 - Heat non-stick skillet or griddle over medium heat. Lightly grease surface with additional butter.
05 - Pour 1/4 cup batter per pancake onto griddle. Cook until bubbles form on surface and edges appear set, approximately 2-3 minutes. Flip and cook second side until golden brown, 2-3 minutes longer.
06 - Combine 1/4 cup sugar and 2 teaspoons cinnamon in small bowl, mixing thoroughly until uniform.
07 - Brush warm pancakes lightly with melted butter. Dust both sides generously with cinnamon sugar mixture while still warm.
08 - Place chopped dark chocolate and heavy cream in microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until chocolate melts completely and mixture becomes smooth and glossy.
09 - Stack coated pancakes on serving plates. Drizzle chocolate sauce over top or serve in small bowl for dipping. Enjoy immediately while warm.