Mix the first 7 ingredients (flour through egg whites) until well-combined. Pour ¼ cup batter on a medium-heat griddle and cook until bubbly; flip and cook again until light golden brown and cooked through.
Stir together pumpkin, brown sugar, and cinnamon. Add ground walnuts or bran if the filling needs to be thicker. Place a in baggie, snip the corner, and spiral filling on the tops of the pancakes.
Whisk Greek yogurt and honey until smooth. Place in a baggie, snip the corner, and drizzle over pancakes in a zigzag pattern. Top with additional walnuts.
