HEAT oven to 350°F.
COOK and stir onions in hot oil in large skillet on medium heat 4 to 5 min. or until crisp-tender. Stir in chicken, tomatoes, 3/4 cup cooking creme and shredded cheese.
SPOON about 1/3 cup chicken mixture down center of each tortilla; roll up. Place in 13x9-inch baking dish sprayed with cooking spray; top with remaining cooking creme. Cover.
BAKE 15 to 20 min. or until heated through.