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Heat the olive oil in a large pan and saute the chicken sausage until it starts to brown, about 5 minutes. Add the chili flakes and garlic and continue cooking for 1 minute. Add the spinach and cook until wilted, another minute.
Add the pasta to the sausage mixture and saute for 1 minute over medium heat.
Place the pasta in a bowl and top with the freshly grated Parmigianino.