French Mushroom Soup with Roasted Garlic Croutons

Name: French Mushroom Soup with Roasted Garlic Croutons
Ingredients: Roasted Garlic Croutons; 2 Heads of Garlic; 1/4 cup Olive Oil; 8 Slices of Rustic Crusty Bread; Kosher Salt; French Mushroom Soup; 4 tablespoons Butter; 2 tablespoons Olive Oil; 4 Large Sweet Onions, Sliced; 8 ounces Cremini Mushrooms, Sliced; 8 ounces Oyster Mushrooms, Sliced; 1 pound Button Mushrooms, Sliced; 6 ounces Shiitake Mushrooms, Stems Removed, Sliced; 1 tablespoon Granulated Sugar; 2 Cloves Crushed Garlic; 2 tablespoons Flour; 6 cups Beef Broth; 1/4 cup Vermouth; 2 tablespoons Balsamic Vinegar; 1/2 cup Heavy Cream or Half and Half; 2 Bay Leaves; 1 teaspoon Fresh Rosemary, Chopped; 1 teaspoon Fresh Thyme, Leaves Only; Salt and Pepper to Taste; 8 ounces Shredded Gruyere Cheese