Penne with Turkey, Sausage, Spinach, and Nutmeg

Heat oil in large deep skillet over medium-high heat. Add onions and sauté until beginning to brown, about 7 minutes. Add ground turkey and sausages. Sauté until cooked through and beginning to brown, breaking up with back of spoon and occasionally scraping bottom of skillet, about 10 minutes. Stir in nutmeg, then cream; bring to simmer. Seaso sauce to taste with salt and pepper. Meanwhile, cook pasta in large pot of boiling salted water until just tender but still firm to bite. Drain, reserving 1 1/2 cups cooking liquid. Add pasta to sauce. Cook over medium heat, adding spinach in batches and tossing until wilted. Stir in 1/2 cup cheese and enough cooking liquid to moisten. Transfer to large bowl. Sprinkle with remaining 1/4 cup cheese; serve.