INGREDIENTS
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Cooking spray
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4 (6-ounce) skinless, boneless chicken breast halves
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1/4 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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1 1/2 tablespoons olive oil
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1 3/4 cups vertically sliced onion
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1 tablespoon minced garlic
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1 ounce chopped pitted kalamata olives (about 14)
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1 medium tomato, halved and sliced
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1/4 cup chopped fresh flat-leaf parsley
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2 teaspoons chopped fresh oregano
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2 teaspoons fresh lemon juice
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1 ounce feta cheese, crumbled (about 1/4 cup)