French Onion Soup Grilled Cheese
INGREDIENTS
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2 large vidalia onions, cut into even slices
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2 Tbsp olive oil
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4 Tbsp butter
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2 Tbsp brown sugar
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1 Tbsp apple cider vinegar
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¼ tsp thyme
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4 slices bread
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3 oz gruyere cheese, sliced thinly
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