Slow Cooker French Onion Soup

Caramelized onions swimming in a rich velvety broth topped with toasted French bread and melted gourmet cheeses! And, it can be made healthy!!!

5 from 2 votes

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Course: Soups and Salads

Cuisine: French

Servings:

Calories: 284kcal

In a large Dutch oven, or heavy-bottomed pot, add butter and brown sugar, allowing the butter to melt. Add onions and sauté on medium heat until they are tender and golden brown (caramelized). This will take about 20 minutes. Stir often to prevent onions from burning.
Add caramelized onions, bay leaf, thyme, broth, Worcestershire sauce, garlic, and sherry to the slow cooker. Cook soup on LOW for 6 hours.
When soup is ready to serve, slice a French baguette into 3/4-inch slices and brush top lightly with olive oil. Broil slices 5 to 6 inches from the top burner for 1 to 2 minutes on each side, or until bread is toasted and light golden brown.
Pour soup into individual OVEN SAFE bowls, making sure there is an ample amount of onions in each. Place a piece of toasted bread on top of the soup. Sprinkle bread with shredded cheese, then top with a round slice of Provolone. Broil in oven for 2 to 3 minutes, or until cheese is melted and bubbly. When serving, remember that the bowls are HOT and your guests will need pot holders for safety.

Lighter and Gluten-Free Option:

When caramelizing the onions, use coconut sugar in place of the brown sugar. Coconut sugar is a light brown all-natural sugar made from the coconut that will not affect the flavor of the onions.
Leave off the French bread, or use a gluten-free bread in its place. If using gluten-free bread, cut the broiling time down because it can easily burn.
If you want this dish to be dairy-free, you can leave off the cheese. I have eaten this soup on many occasions without the bread or the cheese, and I didn't miss a thing! Seriously, the broth and onions are that good!