Whisk together flour and pumpkin pie spice. Set aside.
In a large mixing bowl, cream the ¾ cup butter.
Add both sugars and beat until light and fluffy.
Add eggs one at a time and beat until combined.
Add flour/spice mixture to sugar mixture in three additions. Alternate with pumpkin in two additions, ending with flour mixture.
Stir in chopped pecans and chocolate chunks.
Drop on cookie tray lined with parchment paper.
Bake at 350 degrees for 10-12 minutes or until edges just start to turn brown. Let cool.
Sift the confectioners sugar and set aside.
Melt the ½ cup butter over medium heat until golden brown. Watch closely so it does not burn.
Add butter to sugar, scraping all the butter into the bowl.
Add milk and maple flavoring. Stir until smooth.
Spread on top of cookies with an knife or offset spatula.