Mix crust ingredients in a medium bowl until well combined. Spray a 9x13 baking dish with nonstick spray and press crust into the bottom evenly. Beat pumpkin, cream cheese, melted butter, and eggs until creamy. Add vanilla and pumpkin pie spice. Gradually add powdered sugar, beat well. Spread filling over crust. Bake at 350°F for 50-55 minutes (center will still be slightly giggly).