Preheat the oven to 325 degrees F. Line a large 10x15 inch pan with foil. Crush graham crackers into crumbs in the food processor, or in a zip bag.
Mix the graham cracker crumbs with 1/4 cup sugar, salt, and melted butter. Press the mixture into the bottom of the pan.
Using an electric mixer beat the cream cheese, Crème Fraiche and 3/4 cup sugar together until smooth. Add the pumpkin, flour, five spice, salt, bourbon and eggs. Blend until smooth. Fold in the chocolate chips, reserving a handful for the top.
Pour the mixture on top of the graham cracker crust. Smooth out with a spatula. Sprinkle the rest of the chocolate chips on top. Smack the pan on the counter a couple times to smooth everything out.
Bake for 35-40 minutes, until the center is almost set, but still jiggles a little.
Cool on a rack for one hour, then refrigerate another hour before cutting.
To serve: pull the foil up on the sides and lift the whole pan of pumpkin bars out of the baking dish. Peel the foil off the sides carefully, then slice into desired size. Wipe the knife with a paper towel occasionally to keep the sides smooth.