Start by blending all dressing ingredients together in a jar until smooth, adjusting thickness with buttermilk and seasoning with salt and pepper to your liking.
Next, bring a large pot of salted water to a boil and cook the pasta until it is tender but still firm to the bite, then drain well.
While the pasta is still warm, combine it in a bowl with salsa verde and shredded chicken, then stir in the creamy dressing until everything is evenly coated.
Add the shredded romaine, both types of cheddar cheese, halved cherry tomatoes, chopped cilantro, and crumbled bacon to the bowl; toss gently to mix.
Finish by placing the diced avocado on top and serve the salad warm or chilled, whichever you prefer.