A slow cooker version of classic French onion soup featuring deeply caramelized onions, aromatic thyme, and white wine, topped with cheesy crusty bread. This hands-off method delivers restaurant-quality flavor with minimal active cooking.
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Place the thinly sliced onions into the pot of a slow cooker.
Season with salt and pepper, then add the minced garlic and bay leaf.
Add the brown sugar, dry white wine, Worcestershire sauce, butter, and fresh herbs.
Stir to combine, then cover and cook on high for 8-10 hours until the onions are deeply caramelized.
Once cooked, remove the herb stems and the bay leaf.
Pour in the beef stock and stir to combine.
Arrange slices of baguette over the top of the soup.
Top generously with shredded Gruyère cheese.
Place the slow cooker pot under the broiler (grill) for 8 minutes, or until the cheese is melted, golden, and bubbly.
Serve hot and enjoy.
Store cooled soup in the refrigerator for up to 4 days. Reheat gently on the stovetop over medium heat; add bread topping fresh just before serving.
slow cooker
Typically 6–8 hours on low heat to achieve deeply caramelized onions and developed flavor.
Yes; prepare the soup 1–2 days ahead and refrigerate. Add the cheese-topped bread just before serving to keep it crispy.
Brown sugar enhances caramelization and adds subtle sweetness to balance the onions' natural acidity.
Yes; use dry vermouth, additional beef or vegetable broth, or omit it and add more Worcestershire sauce for depth.
They should be deep golden-brown and very soft, with a sweet, mellow flavor rather than sharp or raw.
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