ADD sun-dried tomatoes, walnuts, garlic, salt, red pepper flakes and black pepper to food processor; process until finely chopped. Gradually add oil; process until combined. Add cheese; pulse to combine.
PREPARE pasta according to package directions, reserving 1/2 cup cooking water. Toss pasta with pesto and 1/4 cup reserved cooking water. Thin with additional water, if desired. Garnish with basil.
