Slow Cooker French Onion Soup

Single digits on the thermometer outside means steaming bowls of rich, satisfying soup inside. Using the slow cooker for this recipe gets you out of the kitchen fast, and the reward is a deep rich broth with smoky caramelized onions. A big bowl of this soup topped with a quick toast of some bread, and creamy Gruyere cheese will warm you from the inside out and chase those bitter temperatures away.
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