Preheat overn to 350 degrees.
In a bowl mix together the butter, pumpkin puree, brown sugar, egg and vanilla.
Add in flour, baking soda, salt and cinnamon and make sure its mixed evenly.
(this is where you would add in chocolate chips or chopped pecans)
Spread the batter into a greased brownie pan.
Mix the topping together and sprinkle evenly over the batter.
Bake for 28-32 minutes.