INGREDIENTS Onions Garlic Thyme Bay leaf Butter Salt Pepper Beef broth Gruyere Croutons
Place the onions, thyme, bay leaf, and butter into the slow cooker. Cover and cook on high heat for 8 hours, stirring once per hour.
After 8 hours, add the broth and cover again to cook an additional 2 hours.
When ready to serve, pour into an oven safe soup bowl and top with crusty bread and shredded cheese. Broil until cheese is melted before serving.