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Meanwhile, bring a large pot of water to a boil and add salt. Add the pasta and cook until al dente, about 12 minutes. Drain, refresh quickly under cool running water, and toss with the remaining 1 tablespoon olive oil.
Stir the butter into the greens and add the pasta and parsley. Toss to heat through and add half of the Parmesan. Toss well again and pour onto a heated serving platter. Dust with the other half of Parmesan and serve.