Very moist
Preheat oven to 350°; position oven rack in the middle of oven.
Spray the bottom only of a 13 x 9 inch baking pan with nonstick cooking spray.
In a big bowl, add cake mix, egg, oil, and 1/2 cup of the apple butter; blend 1-2 minutes with an electric mixer set on low speed until well blended.
Spread evenly into the prepared pan; sprinkle with walnuts.
Bake 30-35 minutes until lightly browned and firm to the touch.
Transfer to wire rack and cool completely.
In a medium bowl, beat softened cream cheese, remaining 1/2 cup apple butter, and cinnamon with mixer set on medium speed.
Beat in powdered sugar until frosting is fluffy.
Spread frosting over cooled bars; cut into bars.
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