In a large bowl, combine dry ingredients (flour through cinnamon) and whisk to combine.
Separate the eggs, placing the yolks in a medium bowl and the whites in a bowl large enough to accommodate an electric mixer.
In the medium bowl with the egg yolks, add the buttermilk, honey, pumpkin, vanilla and butter. Whisk until combined.
Add the buttermilk mixture to the dry ingredients and whisk until just combined. Some lumps are okay.
With an electric mixer or a stand mixer, whip the egg whites until they form soft peaks.
Add the egg whites to the pancake batter and gently fold together until just combined. Its okay to have a few whites that aren't fully incorporated. Add desired amount of blueberries and chocolate chips, fold into batter.
Preheat griddle or large skillet/cast iron pan over medium heat. When hot, spray with cooking oil. Add batter to griddle to make generous sized pancakes. Flip the pancakes when bubbles start to appear on the edges and surface, and the tops appear dull instead of shiny. Cook until both sides are golden brown.
Top with warmed maple syrup and enjoy!
To store: refrigerate up to a week or freeze up to 3 months.