1. Preheat oven to 350°. Bake pecans in a single layer in a shallow pan 6 to 8 minutes or until toasted and fragrant, stirring after 4 minutes.
2. Coat cold cooking grate of grill with cooking spray, and place on grill. Preheat grill to 350° to 400° (medium-high) heat. Cut apples crosswise into 1/4-inch-thick rings, cutting from one side through the other.
3. Grill apple rings, covered with grill lid, 2 to 3 minutes on each side or until crisp-tender. Arrange spinach and spring greens mix on a serving platter; top with apples, cheese, and toasted pecans. Season with salt and pepper to taste. Serve with Brown Sugar-Cider Vinaigrette.