Heat oven to 350ºF. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. In large bowl, mix sour cream, tomatoes, 1 cup of the cheese and the seasoning blend. Stir in chicken.

Spread 1/2 cup of the salsa in baking dish. Spoon 1/2 cup chicken mixture down center of each tortilla; roll up. Place enchiladas, seam side down, over salsa in baking dish. Spoon remaining 1 cup salsa over filled enchiladas; top with remaining 1 1/2 cups cheese.

Bake uncovered 20 minutes or until cheese is melted and enchiladas are thoroughly heated. Garnish with green onions.