Heat oven to 350°F. Lightly spray 13" x 9" pan with cooking spray. I like to double this recipe and bake it in a 18" x 13" x 1" cookie sheet.
In large bowl, stir cake mix, 1/2 cup very soft or melted butter, the pecans, the spices, and 2 teaspoons of the vanilla with fork until crumbs form, but I usually use the mixer. Reserve 1 1/2 cups of the crumbs in small bowl for struesel topping. Press remaining crumbs in bottom of pan. Bake 13 to 15 minutes or until puffy and set. Cool in pan on cooling rack 15 minutes.