Slow Cooker French Onion Soup | Reynolds Brands

Ingredients

• 5 tablespoons unsalted butter
• 5 large yellow onions, sliced (1/4-inch-thick slices)
• 1 tablespoon brown sugar
• 3 sprigs fresh thyme
• Pepper, to taste
• 3 tablespoons all purpose flour
• 1/4 cup soy sauce
• 2 cups chicken stock
• 2 cups beef stock
• 1/2 pound grated Gruyere cheese
• 1 loaf Sourdough bread (optional)