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