Melt butter in electric pressure cooker using SAUTÉ setting. Add onions and baking soda; cook 3 min. or until slightly softened, stirring frequently. Stir in Worcestershire sauce and thyme. Close and lock lid. Turn Pressure Release Valve to Sealing position.
Cook 20 min. using HIGH PRESSURE COOK setting. When timer goes off, use Quick Pressure Release to carefully release pressure before opening lid. Add broth; cook 5 min. using SAUTÉ setting on medium heat.
Meanwhile, heat broiler. Place bread slices in single layer on baking sheet; top evenly with 1/4 cup cheese. Broil, 6 inches from heat; 3 to 5 min. or until cheese is lightly browned.
Turn off pressure cooker. Stir vinegar and remaining cheese into soup. Serve with bread slices.
Substitute KRAFT Shredded Swiss Cheese for the Parmesan cheese.
Serve with a mixed green salad.
Calories From Fat
% Daily Value*
Total Fat 7g
Saturated Fat 4.5g
Trans Fat 0g
Total Carbohydrates 33g
Dietary Fiber 4g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.