Arrange chicken around the edges of a 9" pie plate or baking dish. Sprinkle with chili powder, salt and pepper. Cover with vented plastic wrap. Rotating dish midway through cooking, microwave on high 5 to 6 minutes; set aside. Peel, seed and chop avocado. Combine with limejuice in a small bowl. Add salsa, tomato and green onions; toss gently. Slice cooked chicken, lengthwise, into 1 to 2" strips and arrange on tortillas, making 4 servings. Top with salsa. Microwave on 50 %(medium) for 2 minutes, or until heated. Makes 4 servings.