Begin by preheating the oven to 425 degrees Fahrenheit and preparing a 9x13 baking dish with non-stick cooking spray.
Next in a large bowl, whisk together the sugar and flour. Cut in the butter using a pastry blender until you have a sand like mixture.
Press the flour mixture into the bottom of the prepared baking dish for the crust. Bake this for 13 minutes or until the edges are browned. Then cool on a wire rack until it's cool to the touch.
Take a mixer and beat together the cream cheese and sugar until well blended. Add the egg and vanilla and continue mix until completely combined.
Spread the mixed cream cheese layer over the crust.
Using a new mixing bowl beat together the ingredients for the pumpkin layer. Pour the pumpkin evenly over the cream cheese layer and spread to smooth.
Bake for 60 minutes or until the middle is set.
Cool the bars to room temperature on a wire rack and then refrigerate for at least two hours prior to serving.