1. Heat 1 tablespoon oil in a large skillet over medium-high heat; add prosciutto, and cook 1 to 2 minutes per side or until crisp. Transfer to a plate lined with paper towels. Set aside.
2. Heat 2 tablespoons oil in skillet over medium-high heat. Add onion, and sauté about 3 minutes or until tender. Add tomatoes and next 3 ingredients, and sauté 2 minutes. Add arugula, and sauté until just wilted.
3. Cook tortellini according to package directions. Drain and add to vegetables in skillet; toss gently to combine. Add remaining 1 tablespoon oil, and season with salt and pepper.
4. Crumble prosciutto, and sprinkle over pasta. Garnish, if desired.