Cook pasta according to package directions, adding peas during last 2 minutes of cooking. Drain, reserve 1/4 cup of the cooking liquid.
Meanwhile, stir together ricotta, pesto, Parmesan, salt, and pepper in large bowl. Add pasta mixture, reserved pasta water, and parsley. Toss to coat.
Notes
7 WW PointsPlus and 253 calories per 1 cup serving. Add 1 cup halved cherry tomatoes or sauted zucchini to boost the volume without boosting the Points.