HEAT 2 tablespoons oil in large skillet over medium-low heat. Add onion and vinegar. Cook 15 to 20 minutes or until tender and golden brown. Remove from skillet.
HEAT remaining 2 tablespoons oil in same skillet over medium-high heat. Add green beans, mushrooms and thyme. Cook 4 to 5 minutes, stirring occasionally. Stir in onions and salt. Cook 1 to 2 minutes to until desired doneness. Top with cheese.
Serving Size (1/6 of recipe), Calories 150 (Calories from Fat 100), Total Fat 12g (Saturated Fat 2.5g, Trans Fat 0g), Cholesterol 10mg, Sodium 430mg, Total Carbohydrate 8g (Dietary Fiber 2g, Sugars 4g), Protein 4g; Percent Daily Value*: Vitamin A 6%, Vitamin C 6%, Calcium 10%, Iron 4%.
*Percent Daily Values are based on a 2,000 calorie diet.