Canned pumpkin has more bioavailable beta-carotene than fresh because of the heat used during canning. Dress up this shake with a rim of graham cracker crumbs on each glass instead of sprinkling the crumbs on the shake.
Place first 5 ingredients in a blender; process until smooth. Pour 3/4 cup ice cream mixture into each of 4 glasses. Top each with 1 teaspoon graham cracker crumbs, if desired, and about 2 teaspoons whipped topping. Sprinkle with additional pumpkin pie spice, if desired.