Grease a 9 x 13 dish generously, these are sticky!!.
Pop your popcorn and let cool. Once cool break up the popcorn a bit so the pieces are a bit smaller, this will result in better formed bars. Add the chopped pecans to the popcorn and set aside
In a large saucepan melt the butter and the marshmallows (Make sure the pan is large enough to later incorporate the popcorn and pecans).
Once the marshmallows have melted with the butter and are bubbly add in the pumpkin spice and food coloring, if desired and mix well
Turn off the heat and add the popcorn and pecans to the marshmallows and stir vigorously until the marshmallow mixture has completely covered the popcorn
Transfer the popcorn mixture to the 9 x 13 dish and press until it fills the dish evenly
Let the treats cool at room temperature
For some extra fall pizazz we made some pumpkin spice icing to drizzle on top. Combine ½ teaspoon pumpkin pie spice, ¼ teaspoon cinnamon about ¼ to ½ cup confectioners sugar and water.