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

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

Heat a large skillet over medium heat. Add 1 tablespoon olive oil to pan. Add onion; cook 8 minutes, stirring frequently. Remove pan from heat; stir in dill, spinach, and feta cheese. Cool 10 minutes. Cut a horizontal slit through the center of each chicken breast to form a pocket. Stuff each pocket evenly with spinach mixture. Close pockets with toothpicks. Sprinkle with salt and pepper. Heat skillet over medium-high heat. Add 1 1/2 teaspoons olive oil to pan. Add chicken; cook 4 minutes. Turn chicken. Cover pan, reduce heat to medium, and cook 5 minutes or until chicken is done.