In a large skillet, heat oil over medium-low heat. Add the onions and cook for 15 minutes, stirring frequently, until browned on edges.
Meanwhile, in a large saucepan combine the broth, vinegar, Worcestershire sauce and thyme and bring to a boil over high heat. Boil 8-10 minutes or until reduced to 3 cups. Add the hash browns and onions, return to a boil, reduce heat to a simmer and cook, uncovered, 10 minutes or until potatoes are tender.
Divide the soup into 4 bowls, topping each with 1 slice of toasted bread and 1 tablespoon of cheese.
Notes:
Cook’s Tip: For variation, lightly toast the bread in the broiler (being careful not to burn). Top each slice with cheese and place under broiler again until slightly melted; place on top of soup.
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