1 pound boneless skinless chicken breasts 2 teaspoons olive oil 1 ½ teaspoons salt, divided 1 ½ teaspoons ground black pepper, divided 4 tablespoons butter 1 small yellow onion, diced 4 cloves garlic, minced 4 tablespoons all-purpose flour ½ cup white wine 2 cups chicken broth 2 cups crumbled feta cheese ¼ cup milk 2 cups baby spinach 1 puff pastry sheet, thawed 1 egg 1 tablespoon water
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