PREHEAT oven to 350º F. Grease 13 x 9-inch baking pan.
STIR together baking mix, sugar and cinnamon in large bowl. Stir in pumpkin, eggs, water and vanilla extract just until moistened. Stir in half baking bars and half nuts. Spread into prepared baking pan.
BAKE for 20 minutes. Sprinkle with remaining baking bars and remaining nuts. Bake for additional 10 to 15 minutes or until wooden pick inserted in center comes out clean. Cool completely in pan on wire rack.