Heat electric griddle to medium and spray with nonstick cooking spray.
In a medium bowl, whisk together flour, sugar, brown sugar, cocoa powder, baking powder, pumpkin pie spice, and salt.
Add milk, pumpkin puree, egg, and vegetable oil and mix to combine.
Scoop out by 1/4 cupfuls onto preheated griddle and cook until edges are firm and bubbles begin to form on top; 2-3 minutes. Flip and cook additional 2-3 minutes until pancakes are done.
Serve immediately sprinkled with powdered sugar, if desired, and your favorite pancake toppings.