Elevate your chicken breast by stuffing it with a delicious spinach and feta filling. Butterfly the chicken breasts by cutting a slit horizontally through the thickest part, without cutting all the way through. In a bowl, mix together cooked spinach, crumbled feta cheese, minced garlic, and dried herbs. Stuff the mixture into the chicken breasts and secure with toothpicks. Season the chicken with salt, pepper, and your choice of spices. Bake in the oven until the chicken is cooked through. The combination of tender chicken, flavorful filling, and melted feta cheese makes this dish a winner.