Bake or air fry the frozen chicken breast according to the package instructions until fully cooked and golden.
Bring a large pot of salted water to a boil and cook the pasta according to package instructions.
While the pasta cooks, blend the cottage cheese and basil pesto using a food processor or immersion blender until smooth.
Before draining the pasta, reserve about 1 cup of pasta water. Drain the pasta and return it to the pot with the heat turned off.
Add the blended pesto cottage cheese sauce and gently stir to coat the pasta.
Gradually add 1/4 to 1/2 cup of the reserved pasta water while stirring until the sauce becomes creamy and silky.
Season with salt to taste.
Slice or chop the cooked chicken and serve it over the pasta. Garnish with grated Parmesan, black pepper, and chopped pistachios.