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Slow Cooker French Onion Soup

A vegetarian french onion soup made in the slow cooker and broiled with french baguette slices and baby Swiss.

like YEP RATING: 95% (22 total votes)
Slow Cooker French Onion Soup

Servings: 6
Total Time: 8 hours 30 minutes
Recipe by: Frankie


4 TBSP unsalted butter
4 pounds (about 5 large) yellow onions, halved and thinly sliced
1/2 tsp dried thyme
salt & freshly ground pepper
1/2 cup cooking sherry
4 cups vegetable broth
2 TBSP soy sauce
french baguette, sliced
8 ounces baby Swiss cheese, grated


1. Add the butter, onions, thyme, 1/2 tsp salt, and 1/2 tsp pepper to a 5-quart slow cooker. Cover the slow cooker and cook on HIGH for 6 hours.

2. Stir the vegetable broth, soy sauce and sherry into the slow cooker with the onions. Cover the slow cooker and cook on HIGH for 2 more hours. Season with salt & pepper to taste.

3. Preheat the oven broiler. Lay the bread slices on a baking sheet and place in the broiler, toast the bread on one side then flip over and toast the other side, 1 to 2 minutes per side, you want the bread well toasted but keep an eye on it so it doesn't burn.

4. Divide the soup between 6 broiler safe bowls or large ramekins. Roughly break up the toasted bread on top off the soup then sprinkle Swiss cheese on top of the bread. Place bowls of soup in the broiler and cook until well browned on top, about 5 minutes.

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Slow Cooker French Onion Soup

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