01 - In a large mixing bowl, whisk together flour, granulated sugar, baking powder, baking soda, salt, and ground cinnamon until well combined.
02 - In a separate bowl, whisk together whole milk, eggs, melted butter, and vanilla extract until fully incorporated and smooth.
03 - Pour the wet ingredients into the dry ingredients. Gently fold until just combined; small lumps are acceptable. Let the batter rest for 5 minutes to thicken slightly.
04 - Preheat a non-stick skillet or griddle over medium heat. Lightly grease the surface with butter to prevent sticking.
05 - Pour 1/4 cup of batter per pancake onto the heated surface. Cook until bubbles form across the surface and edges appear set, approximately 2-3 minutes. Flip and cook for an additional 2-3 minutes until golden brown.
06 - While pancakes cook, combine 1/4 cup granulated sugar and 2 teaspoons ground cinnamon in a small bowl. Mix thoroughly until evenly distributed.
07 - Immediately after cooking, lightly brush warm pancakes with melted butter if desired. Generously dust both sides with the cinnamon sugar mixture while still warm.
08 - Place chopped dark chocolate and heavy cream in a microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until completely melted and glossy. Alternatively, heat in a small saucepan over low heat, stirring constantly.
09 - Stack coated pancakes on serving plates. Drizzle with warm chocolate sauce or serve sauce alongside for dipping. Enjoy immediately while warm.