Cook the penne pasta according to package instructions until al dente. Drain and rinse under cold water to cool.

In a large mixing bowl, combine the cooked pasta, shredded chicken, diced celery, red bell pepper, and green onions.

In a separate bowl, whisk together the buffalo sauce, ranch dressing, and olive oil until well combined.

Pour the dressing over the pasta mixture and toss until everything is evenly coated.

Chill in the refrigerator for at least 30 minutes before serving for best flavor.