Slow Cooker French Onion Soup (Printer-Friendly)
Caramelized onions simmered in rich beef broth, finished with toasted baguette and melted Gruyère for ultimate comfort.
# What You'll Need:
→ Vegetables
01 - 5 large yellow onions, thinly sliced
02 - 2 cloves garlic, minced
→ Liquids
03 - 6 cups beef broth
04 - 1/2 cup dry white wine
→ Dairy
05 - 2 cups shredded Gruyère cheese
06 - 2 tablespoons unsalted butter
→ Breads
07 - 1 baguette, sliced into 1/2-inch rounds
→ Seasonings
08 - 1 teaspoon salt
09 - 1/2 teaspoon black pepper
10 - 2 teaspoons fresh thyme leaves
11 - 1 bay leaf
# How-To Steps:
01 - Melt butter in a large skillet over medium heat. Add sliced onions and cook, stirring frequently, until soft and lightly golden, approximately 10-15 minutes.
02 - Stir in minced garlic and continue cooking for 1 minute until fragrant.
03 - Transfer onion mixture to slow cooker. Pour in beef broth, white wine if using, thyme, bay leaf, salt, and pepper. Stir thoroughly to incorporate all ingredients.
04 - Cover and cook on low setting for 6-8 hours until onions achieve deep caramelization and flavors have fully melded. Remove and discard bay leaf before serving.
05 - Preheat broiler 20 minutes before serving. Arrange baguette slices on baking sheet and toast until golden brown, approximately 1-2 minutes per side.
06 - Ladle hot soup into oven-safe bowls. Top each portion with toasted baguette slice and generous amount of Gruyère cheese. Place bowls on baking sheet and broil until cheese becomes bubbly and golden, about 2-3 minutes.
07 - Serve soup piping hot, garnished with additional fresh thyme sprigs if desired.
# Expert Hints:
01 -
- The slow cooker does all the heavy lifting while you go about your day
- That first spoonful with melted cheese feels like a restaurant meal at home
02 -
- Skip the stovetop step and the onions will never develop that deep caramelized flavor, no matter how long they cook
- Oven-safe bowls are non-negotiable since regular bowls will crack under the broiler
03 -
- Slice onions uniformly so they cook down at the same rate
- Patience with the initial stovetop caramelizing pays off in the final flavor