Line a 9 x 13-inch baking pan with foil, set aside

In a medium-sized heavy duty saucepan, combine sugars, butter, evaporated milk, pumpkin and pumpkin pie spice

Stirring constantly, bring to a rolling boil over medium heat

Continue to constantly stir and boil for 12-13 minutes, or until a candy thermometer reads 234-240 degrees f {soft boil stage}

Immediately stir in white chocolate morsels, marshmallow crème, nuts and vanilla

Stir quickly until morsels are melted and mixture is well combined, about 1 minute

Poor mixture into prepared foil-lined pan

Let sit until completely cooled, about 2 hours

Lift from pan and cut into 1-inch pieces

Store tightly covered in refrigerator