Whisk together the lemon juice, extra-virgin olive oil, Greek seasoning, and lemon zest in a bowl. Pound the chicken breasts between sheets of wax paper or plastic wrap to a thickness of 1/4 inch. Marinate the chicken in the lemon marinade at least 30 minutes. Meanwhile, stir together the feta cheese, sun-dried tomatoes, kalamata olives, and 1 tablespoon of oil from the jar of sun-dried tomatoes in a small bowl; set aside.
Preheat oven to 375 degrees F (190 degrees C).
Remove the chicken from the marinade, and shake off excess. Discard the remaining marinade. Divide the stuffing mixture onto each piece of chicken. Fold the edges of the chicken over the filling, and secure with toothpicks. Place onto a baking dish, seam-side down, and place two roasted pepper strips onto each stuffed breast.
Bake in the preheated oven until the chicken is no longer pink, about 30 minutes. Remember to remove the toothpicks before serving.