You can substitute spinach for the arugula, if you like. For less heat, decrease or omit the crushed red pepper.
Serves 4 (serving size: 1 1/2 cups pasta and 1 teaspoon cheese)
1. Bring a large saucepan of water to a boil. Add pasta; cook 7 minutes or until al dente. Drain pasta in a colander over a bowl, reserving 1 cup cooking liquid.
2. Heat a large skillet over medium-high heat. Coat pan with cooking spray. Add sausage to pan; cook 5 minutes or until browned, stirring to crumble. Add 1 cup arugula, onion, oregano, crushed red pepper, and garlic; cook 2 minutes, stirring frequently.
3. Add reserved 1 cup cooking liquid, tomatoes, sugar, black pepper, and salt to pan; bring to a boil. Add pasta; cook 2 minutes. Stir in remaining 1/2 cup arugula. Divide pasta mixture among 4 shallow bowls; top with Parmesan cheese.