Pound chicken until 1/4" thick. Season with salt and pepper. Refrigerate until ready to use.
In food processor, combine olive oil, sun-dried tomatoes, garlic and parsley. Spread mixture onto each chicken breast. Press 3 leaves baby spinach onto each chicken breast, top with sprinkling of feta cheese. Roll each breast away from you.
Place chicken on baking sheet. Bake in 350°F oven for about 20 minutes or until juices run clear.