Preheat oven to 350 degrees F. Line a 11x7 inch baking pan (BROWNIE PAN) with parchment paper.
Place the cake mix in a medium size mixing bowl. Add the oil and 1 egg. Stir the mixture together with a fork until combined and mixture is still crumbly. Save 3/4 cup of the mixture for later use. Stir the pecans into this mixture. Press the remaining mixture into the pan.
Bake for 9 minutes then remove from the oven.
In a large mixing bowl, using an electric mixture on medium speed, beat together the cream cheese, sugar, pumpkin, remaining egg, cinnamon and vanilla until well combined.
Spread the cream cheese and pumpkin mixture over the crust. Crumble the reserved topping and drop evenly over top of the filling.
Bake for 15-20 minutes or until filling is set and top crust is light golden brown. Remove from the oven.
Set pan on a wire cooling rack and cool for about 40 minutes. Remove the cake bars from the pan by picking up the parchment paper on the side, set on a cutting board.
Allow bars to cool about 2 hours. Cut into the size bars desired. Yields 24 (1 1/2-inch bars). Refrigerate bars until ready to serve.