INGREDIENTS
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1 tablespoon olive oil
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1 cup chopped yellow onion
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2 tablespoons chopped fresh dill
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5 ounces baby spinach
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2 ounces crumbled feta cheese (about 1/2 cup)
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4 (6-ounce) skinless, boneless chicken breasts
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1/2 teaspoon kosher salt
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1/4 teaspoon black pepper
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1 1/2 teaspoons olive oil