Mix Cake mix, eggs, oil, pumpkin pie spice and coloring until smooth.
Spray a 13x9" baking pan with baking spray.
Spread the mix into the pan and bake at 350 degrees for 15 minutes.
Remove from oven, cool completely.
Frosting:
Beat butter with shortening, add powdered sugar, cream, spice and extract and mix until smooth.
Spread icing on cooled brownies.
Add sprinkles to the top of the frosting. (don't wait or the frosting will firm up and they won't stick)
Cut and serve.