This easy slow cooker French onion soup guarantees all of the cozy vibes! This soup is packed with flavour, cartelized onions, toasty baguette and melted cheese. And since it cooks slow in the crock pot, it makes your home smell amazing.
To your slow cooker, add sliced onions, butter, olive oil, salt, pepper, sugar, bay leaves and thyme. Cook on low for 10-12 hours or overnight.
After 12 hours, the onions should be caramelized and fragrant. Carefully remove the bay leaves and thyme. Add broth and wine (I used red), stir to combine and cook on low for another 6-8 hours.
Arrange oven-safe bowls on a baking sheet and portion out soup. Top each bowl with 2-3 slices of toasted baguette and approx. 1/4 cup shredded gruyere cheese.
Broil in the oven until cheese is melted and bubbly. Serve immediately and enjoy!