Roasted Sweet Potato Salad

• 1½ lb. sweet potatoes (about 4), peeled, cubed
• 1/3 cup KRAFT Zesty Italian Dressing, divided
• 3 Tbsp. KRAFT Real Mayonnaise
• 2-3 stalks celery, chopped
• ½ cup chopped PLANTERS Walnuts, toasted
• 4 cups chopped red or green onions
   
  Directions:

Heat oven to 400°F. Toss potatoes with 3Tbsp. dressing: spread onto bottom of foil-lined shallow pan. Bake 25-30 min. or until potatoes are tender, stirring after 10-15 min. Cool completely. Mix mayo and remaining dressing in large bowl. Add potatoes, celery, nuts, and onions; Toss. Cool for 3-4 hours before you serve.