Preheat oven to 350 Ff. Pour Snack Cake Mix into an ungreased 8 or 9 inch square baking pan.

In a medium bowl, combine egg, oil, carrots, orange juice and cinnamon, beating with a fork to blend. Stir into Snack Cake Mix until blended. Stir in nuts. Bake 35 to 45 minutes or until a wooden pick comes out clean. Cool cake on a rack. Spread frosting evenly over cake.

Cream Cheese Frosting: In a small bowl, cream butter or margarine and cream cheese until light and fluffy. Beat in powdered sugar and vanilla until smooth.