Cut chicken into 1-inch pieces; season with salt and pepper. Heat a 6-quart Dutch oven over medium heat until hot. Add half of chicken to pot; cook, turning occasionally, until nicely browned, about 7 minutes. Transfer to a large bowl. Repeat with remaining chicken; set aside.
Meanwhile, cut carrots, celery, and parsnips into 3/4-inch pieces. Place vegetables, onions, water, broth, and rosemary in Dutch oven; scrape browned bits from the bottom. Cover; bring to a simmer over low heat. Cook, stirring occasionally, until vegetables are barely tender, about 10 minutes.
Cook noodles in a saucepan of boiling salted water until al dente; drain. Stir noodles, parsley, chicken, and any collected juices in the bowl into pot. Cook on low until chicken is heated through, 1 to 2 minutes. Remove from heat; keep warm.
Meanwhile, melt butter in a large nonstick skillet over medium-high heat. Add garlic; stir until golden, about 1 minute. Add chard; cook, turning occasionally, until tender, about 5 minutes. Divide chard among six bowls. Ladle soup on top; serve with shaved Parmesan cheese.
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