In a large bowl whisk flour, baking soda, baking powder, salt, cinnamon, nutmeg, ginger, cloves. Set aside.
In a separate bowl combine pumpkin puree, buttermilk, melted butter, and egg yolks and vanilla and stir until combined.
Add the wet ingredients to the dry ingredients. Mix for just a few strokes so that the mixture is only partially combined. Don’t overmix.
In a small bowl whip the egg whites until frothy. Add the brown sugar and whip until soft peaks form.
Fold the egg whites into the batter, just a few strokes. Then add the chocolate chips and fold until combined.
Heat a griddle to 300-350°F, using a 1/3-1/2 cup measuring cup, scoop the batter onto the griddle. Cook until the bottom is golden brown. Flip. And cook the other side until golden brown.
Serve plain or with maple butter, syrup, or with a dusting of powdered sugar.