This Penne with Sausage, Spinach, and Arugula recipe is a delicious and hearty pasta dish that combines the flavors of spicy sausage, fresh spinach, and peppery arugula. The penne pasta is cooked until al dente and then tossed with a flavorful sauce made from sautéed sausage, garlic, and crushed red pepper flakes. The spinach and arugula are added at the end and wilted down, adding a vibrant green color and a healthy dose of vitamins. This dish is perfect for a quick and satisfying weeknight dinner.