Ingredients

1/4 cup chopped sweet onion1-1/2 teaspoons olive oil, divided3 cups fresh baby spinach, chopped1/2 teaspoon minced garlic1-1/2 teaspoons balsamic vinegar2 tablespoons crumbled feta cheese1/4 teaspoon grated lemon zest1/8 teaspoon salt1/8 teaspoon pepper2 boneless skinless chicken breast halves (6 ounces each)

Preparation

In a small skillet, cook onion in 1 teaspoon oil over medium heat for 10-15 minutes or until onion is golden brown, stirring frequently. Add the spinach, garlic and vinegar; cook 1 minute longer. Remove from the heat; cool for 5 minutes. Stir in the cheese, lemon zest, salt and pepper.

Flatten chicken to 1/4-in. thickness. Spread spinach mixture over chicken. Roll up and secure with toothpicks.

In a small skillet over medium heat, cook chicken in remaining oil for 8-10 minutes on each side or until chicken juices run clear. Discard toothpicks.