French Onion Soup Burgers

Name: French Onion Soup Burgers
Cook time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 1 1/2 pounds ground beef; 1 packet or about 4 to 6 tablespoons Lipton Onion Soup Mix; 2 1/2 tablespoons butter; 2 large onions, thinly sliced; a pinch of thyme; water as needed, about a 3/4 cup; 1 tablespoon brandy or Sherry (optional, but recommended); 4 to 8 ounces Swiss or Provolone cheese; 4 buns and a little butter or oil to brush them with