INGREDIENTS
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3 bacon slices
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1 tablespoon olive oil
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1 cup chopped yellow onion (about 1 medium onion)
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1 cup 1/4-inch-thick diagonally cut carrots (about 2 medium carrots)
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1 cup 1/4-inch-thick diagonally cut celery (about 3 stalks)
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1 tablespoon garlic cloves, minced (about 3 garlic cloves)
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1 teaspoon kosher salt
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1/2 teaspoon black pepper
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4 (6-oz.) boneless, skinless chicken breasts
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4 cups low-sodium chicken broth
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1 cup uncooked quick-cooking barley
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1 (8-oz.) package baby spinach
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2 tablespoons chopped fresh flat-leaf parsley