Pumpkin Pie Dessert Lasagna


1 sleeve graham crackers
6 ounces melted butter
8 ounces low fat cream cheese
¼ cup heavy cream
1 cup powdered sugar
¾ can pumpkin puree (not pumpkin pie filling)
½ Tablespoon pumpkin pie spice
2 8 ounce containers of lite Cool Whip plus another ½ container (4 ounces) cool whip
15 ladyfinger cookies
6 ounces good quality white chocolate, melted
1 cup pumpkin spice chips (if you can’t find these, white chocolate chips would also be delicious!)
1 cup chopped pecans (optional)