To make the dressing. Combine all ingredients in a glass jar and whisk until smooth. Season with salt and pepper. Thin as desired with buttermilk. Bring a large pot of salted water to a boil. Boil the pasta to al dente, according to package directions. Drain.In a large bowl, toss together the hot pasta, salsa verde, and chicken. Pour over the dressing and toss well to combine. Add the cheese, lettuce, tomatoes, cilantro, and bacon. Toss, then top with avocado. Serve warm or cold. Enjoy!