Preheat an electric griddle to 350°F, or set a large skillet over medium heat. This ensures your cooking surface is hot and ready when the batter is mixed. I like to start preheating early so there’s no waiting around when the batter is ready.
In a large bowl, whisk together the all-purpose flour, packed light brown sugar, baking powder, kosher salt, ground cinnamon, ground nutmeg, ground ginger, and ground cloves until thoroughly combined. Set aside after mixing.
In a medium bowl, whisk together the buttermilk, canned pumpkin, large egg, melted and cooled unsalted butter, and pure vanilla extract until smooth. Make sure the butter is not hot, to prevent scrambling the egg.
Pour the wet ingredients from Step 3 into the bowl of dry ingredients from Step 2. Stir just until combined; the batter should be thick and a little lumpy. Be careful not to overmix the batter—overmixing can make the pancakes tough. If you prefer thinner pancakes, add a bit more buttermilk at this stage.
Lightly coat the preheated griddle or skillet with nonstick cooking spray or a small amount of butter. Spoon about 1/3 cup of batter per pancake onto the surface. Cook until bubbles form and the edges look set, about 2-3 minutes. Carefully flip and cook for another 2-3 minutes or until golden brown and cooked through. Repeat with remaining batter. I find using an ice cream scoop helps portion the batter evenly.
Serve the pancakes warm, topped with a pat of butter and a drizzle of maple syrup, if desired. These pancakes are especially delightful fresh off the griddle with the classic toppings.