In a large bowl, whisk together flour, dark brown sugar, baking powder, baking soda, salt, ground ginger, cinnamon, nutmeg, and cloves.
In a separate bowl, whisk together buttermilk, dark molasses, eggs, melted butter, and vanilla extract until completely smooth.
Pour wet ingredients into dry ingredients and fold gently with a spatula just until combined. Do not overmix; leave small lumps. Let batter rest for 5-10 minutes.
Preheat a cast iron skillet or electric griddle to medium heat (350°F / 175°C) and lightly brush with melted butter.
Pour 1/3 cup batter per pancake onto griddle. Cook for 2-3 minutes until bubbles form and pop on the surface and edges look set.
Gently flip and cook for another 1-2 minutes until golden-brown and puffed. Repeat with remaining batter.
In a small bowl, whip softened butter with powdered sugar and a pinch of cinnamon until creamy.
Stack hot pancakes, crown with whipped vanilla butter, drizzle with warm pure maple syrup, and enjoy!