Mom dumps 3 lbs of onions in slow cooker overnight, makes irresistible meal

French Onion Soup

This beloved French classic turns rich and comforting when made in the slow cooker. Long, gentle cooking coaxes out the onions’ natural sweetness, creating a deeply caramelized base for a flavorful beef broth. Topped with crispy bread and gooey Gruyère, it’s an elegant dish that warms the soul.

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🧅 Ingredients

Ingredient	Quantity
Yellow onions, thinly sliced	3 pounds
Unsalted butter, melted	2 tablespoons
Olive oil	2 tablespoons
Balsamic vinegar	¼ cup
Fresh thyme sprigs	2
Beef stock	8 cups
Shredded Gruyère cheese	1½ cups
Salt and pepper	To taste
Brandy (optional)	⅓ cup
Crunchy bread slices	For serving

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🍲 How to Make It

Step 1: Caramelize the Onions
Add the sliced onions to your slow cooker. Drizzle with melted butter and olive oil, then season lightly with salt and pepper. Cover and cook on LOW for 10–12 hours, until the onions turn a rich, golden brown and are beautifully caramelized.

Step 2: Build the Broth
Stir in the beef stock, balsamic vinegar, and thyme leaves (discard the stems). Continue cooking on LOW for another 6–8 hours, allowing the flavors to meld. Adjust seasoning to taste, and if desired, add the brandy for extra depth.

Step 3: Prepare the Toppings
Preheat your oven to 350°F (180°C). Ladle the soup into oven-safe bowls placed on a baking sheet. Top each serving with a toasted slice of bread and a generous handful of shredded Gruyère.

Step 4: Melt and Broil
Bake for 20–30 minutes, until the cheese is melted and bubbly. For a golden crust, switch to broil for 2–3 minutes, keeping a close eye to avoid burning.

Step 5: Serve and Savor
Let the soup cool slightly before serving. Enjoy each spoonful of rich broth, caramelized onions, and cheesy bread — pure French comfort in a bowl.