Slow-Cooker French Onion Soup Recipe

"In this genius slow-cooker soup recipe, two types of onions are caramelized for hours before adding a sherry-spiked broth. For a bistro-worthy presentation, ladle the soup into ovenproof crocks, top with the bread and cheese and broil...."

INGREDIENTS
Soup
2 tablespoons butter, cut into 8 pieces
2 tablespoons extra-virgin olive oil
8 sprigs fresh thyme
4 cloves garlic, smashed
1 bay leaf
2 pounds yellow onions, halved and sliced (see Tip)
2 pounds red onions, halved and sliced
1 teaspoon salt
¾ teaspoon ground pepper
4 cups low-sodium beef broth
¼ cup dry sherry
Cheese Toasts
8 diagonal slices baguette ( ½-inch-thick), toasted
1 cup shredded Gruyère or Swiss cheese
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