Set your oven to 350 degrees Fahrenheit and grease a 9x13-inch baking dish with nonstick spray.
Cook the angel hair pasta according to package instructions, then drain it thoroughly.
Return the pasta to the pot and stir in the cooked chicken, cream of chicken soup, salsa, sour cream, half of the Mexican cheese blend, and taco seasoning until everything is evenly mixed.
Transfer this mixture into your prepared baking dish and sprinkle the remaining cheese blend evenly on top.
Cover the dish with foil and bake in the oven for around 25 minutes, until the casserole is heated through and bubbly.
If you like, sprinkle dried parsley over the top before serving for a touch of color and flavor.