French Onion Soup with Baguette Crostini

Name: French Onion Soup with Baguette Crostini
Ingredients: 4 tablespoons unsalted butter; 5 large yellow onions, sliced into half rounds (about 3 to 4 pounds); Salt and freshly ground black pepper; 1 cup red wine; 2 cups semisweet white wine; 1 1/2 cups beef stock or 2 cups beef broth; 1 tablespoon minced fresh parsley leaves; 1 teaspoon minced fresh thyme leaves; 2 bay leaves; 1 tablespoon minced garlic; 1 baguette, sliced into 1/2-inch rounds; 3 tablespoons grapeseed oil; 1 cup grated Gruyere, Provolone, or Swiss cheese