Preheat oven to 350°; position oven rack in the middle of oven; spray cookie sheets with nonstick cooking spray.
In a big mixing bowl, add half the cake mix along with cinnamon, oil, and eggs; blend with an electric mixer on med-high speed, 1-2 minutes, until blended and smooth.
Stir in the remaining cake mix, apple, and cranberries with a wooden spoon until all dry ingredients are moistened.
Drop dough by teaspoonfuls, 2 inches apart, onto prepared cookie sheets.
Sprinkle tops with a few chopped walnuts; gently press into the dough.
Bake 9-12 minutes or until set at edges and just barely set at center when lightly touched.
Cool 1 minute on sheets; transfer to wire racks with a metal spatula and cool completely.