"The slow-cooker is the ideal way to make big batches of luscious, brown, meltingly tender Caramelized Onions for whatever purposes you like them. Included is my recipe for perfect French Onion Soup using the caramelized onions as a base...."
INGREDIENTS
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12 small to medium sized yellow onions
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3 medium sized red onions
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6 tablespoons olive oil
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1/2 teaspoon kosher salt
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1/2 teaspoon dried thyme
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1 1/2 cups beef broth
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1 1/2 cups chicken broth
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kosher salt and black pepper to taste
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6-8 slices French bread (1 to 1 1/2-inches thick each)
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olive oil for drizzling
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6-8 thin slices Swiss cheese (or 1/4 pound grated Swiss cheese, or more to taste)