1. Place each chicken breast half between 2 sheets of waxed paper. Flatten to 1/4-inch thickness, using a meat mallet or a rolling pin. Brush chicken with melted butter; sprinkle with garlic salt and pepper.
2. Combine cheese and green onions. Place 1/4 of cheese mixture in center of each piece of chicken; roll up lengthwise, tucking edges inside. Secure each roll with a wooden pick.
3. Place in a lightly greased 10 x 6 x 2-inch baking dish. Cover with aluminum foil; bake at 375° F. for 25 minutes or until tender. Remove wooden picks. Top with parsley and serve immediately.