Preheat oven to 350 degrees.
In a large bowl cream together the butter, sugar, and eggs.
Stir in pumpkin and vanilla.
Then stir in the cocoa powder until the batter is dark and chocolatey.
Add the flour, pumpkin pie spice, salt, and baking powder to the bowl and stir until all of the ingredients are combined.
Slowly stir in the chocolate chips.
Pour the brownie batter into a 9-inch baking pan and bake for 22-23 minutes or until a toothpick is inserted and crumbs stick to it.
Let the brownies cool in the pan for about 10 - 15 minutes and then cut into 16 squares.