Slow Cooker French Onion Soup: Set It & Forget It!

Ingredients

• 3 tablespoons unsalted butter (45g)
• 4 large yellow onions, thinly sliced (about 4-5 lbs/2-2.25kg)
• 2 cloves garlic, minced
• 1 teaspoon dried thyme
• 1/2 teaspoon dried bay leaf
• 1/4 cup dry sherry (optional, but adds depth!) (60ml)
• 8 cups beef broth (low sodium recommended) (1.9 liters)
• 1 tablespoon Worcestershire sauce (15ml)
• Salt and freshly ground black pepper, to taste
• 6 slices baguette, about 1 inch thick
• 2 tablespoons olive oil
• 4 ounces Gruyère cheese, shredded (115g)
• Optional: A sprinkle of freshly chopped parsley to garnish