Slow Cooker French Onion Soup is the Easiest Way to Make Dinner

slow cooker french onion soup in a serving dish
Prep Time
30 min
Cook Time
4-6 servings

Love French onion soup? Don’t have time to stand around caramelizing onions? Then this slow cooker version is the perfect way to satisfy those cravings. Slow cooker soups are a great way to get a meal on the table with very little prep time and this is no exception. This is a perfect easy soup recipe for a chilly fall evening. It’ll make your home smell amazing and it’ll taste like you’ve spent hours in the kitchen when, in fact, it’s the slow cooker doing all the work for you!




lbs onions, halved and sliced
Tbsp unsalted butter, melted
tsp brown sugar
L beef stock
Tbsp brandy (optional)
sprigs fresh thyme, plus some for garnish
Freshly ground black pepper
slices baguette
1 ½
cups grated Swiss cheese


mise en place for slow cooker french onion soup
Step 1

Place sliced onions, butter and sugar in a 6-quart slow cooker. Stir to combine.

Step 2

Cover and cook on high for 6 to 7 hours, removing the lid and stirring from time to time. Many recipes suggest doing this overnight, but as all slow cookers are different, it’s best to be around when these are cooking so you can keep an eye on them so they don’t burn. The onions should be deep brown before you put the rest of the ingredients in.

Step 3

Add the stock, brandy, thyme and pepper. Cover again and cook on high for approximately 2 hours.

slow cooker french onion soup in a while bowl
Step 4

Remove the lid, scoop out the thyme sprigs and stir.

Step 5

Pre-heat your oven broiler to high. Prepare your oven-safe soup bowls by placing them on a parchment-lined tray. Top each bowl of soup with 2 slices of baguette and approximately ¼ cup grated cheese.

Step 6

Broil for approximately 5 minutes or until the cheese is melty and golden brown. Top with a few fresh thyme leaves to serve.

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