French Onion Soup with Worcestershire Sauce

Name: French Onion Soup with Worcestershire Sauce
Prep time: 10 min
Cook time: 1 h
Total time: 1 h 10 min
Cuisine: French
Ingredients: 18 oz yellow onion; 2 tbsp extra virgin olive oil ((save one for later)); 1 tbsp butter; 1 tsp granulated sugar; 3 bay leaves; 2 tsp thyme ((or a few springs)); ½ tsp salt; 3 cups beef broth; 1 tsp Worcestershire sauce; ½ tsp apple cider vinegar; ½ cup Swiss ((grated)); 2 slices baguette ((+ some olive oil for drizzling))