Whisk Dry Ingredients: In a large mixing bowl, whisk together the all-purpose flour, dark brown sugar, ground ginger, cinnamon, nutmeg, cloves, allspice, baking powder, baking soda, and fine sea salt until thoroughly blended and spice clumps are eliminated.
Whisk Wet Ingredients: In a separate medium bowl, whisk together the buttermilk, dark molasses, eggs, melted butter, and pure vanilla extract until completely smooth and emulsified.
Combine into Batter: Pour the wet molasses mixture into the dry flour bowl. Stir gently with a rubber spatula just until combined and no dry flour streaks remain. Do not overmix; small flour lumps are completely fine and keep the pancakes ultra-fluffy.
Rest the Batter: Let the pancake batter rest on the counter for 8 to 10 minutes. The buttermilk acid will activate the baking soda and powder, creating tiny air bubbles throughout the thick batter.
Heat Griddle & Cook: Heat a seasoned cast-iron skillet or nonstick griddle over medium heat (approx 350°F). Brush lightly with melted butter. Pour 1/3 cup of batter per pancake. Cook for 2.5 to 3 minutes until bubbles form across the surface and edges look set.
Flip & Serve Golden: Gently flip with a wide spatula and cook for an additional 1.5 to 2 minutes until deeply golden-brown and cooked through the center. Transfer to a warm plate and serve stacked high with cinnamon butter, warm maple syrup, and a sprinkle of powdered sugar.