1. Heat oil in large deep nonstick skillet over medium heat. Add mushrooms and sauté until tender, about 4 minutes. Add garlic and crushed red pepper and stir 1 minute. Add broth and bring to boil. Stir in escarole; cover and cook 5 minutes. Uncover and cook until escarole is tender, stirring often, about 3 minutes longer. Season with salt and pepper.
2. Meanwhile, cook pasta in large pot of boiling salted water until just tender but still firm to bite. Drain; return to pot. Add escarole mixture, chicken, and sun-dried tomatoes. Stir over medium heat until chicken is heated through, about 3 minutes. Season with salt and pepper. Transfer to bowl; sprinkle with cheese.
3. Per serving: calories, 385; total fat, 13 g; saturated fat, 3 g; cholesterol, 61 mg Nutritional analysis provided by Bon Appétit