Slow Cooker French Onion Soup

Step 1

Melt the butter in a large skillet, then add the sliced onions.
Sautee until tender, about 5 minutes.
Stir in the sugar, salt, and black pepper, and continue to sautee for 20 minutes, stirring occasionally.
Transfer the onions to the slow cooker.
Add in the chicken stock, white wine, and thyme.
Cook on low for 7 to 8 hours, or on high for 4 hours.
Check for salt and pepper.
Turn the oven-broiler on High.
Ladle soup into ovenproof bowls.
Top the bowls with a slice of french bread and cheese.
Broil in oven until cheese is melted, 3 to 5 minutes.