French Onion Butternut Squash Soup

Name: French Onion & Butternut Squash Soup
Ingredients: 3 tablespoons unsalted butter; 1 tablespoon extra virgin olive oil; 2 pounds yellow onions, cut in half lengthwise and thinly sliced; Kosher salt and freshly ground pepper; 4 cups butternut squash, diced; 1 tablespoon unbleached all-purpose flour; 1/2 cup dry sherry; 4 cups Swanson Beef Stock; 2 tsp. fresh chopped thyme; 1/2 French baguette, sliced on a bias into 3/4-inch thick pieces; 4 cups grated gruyere cheese