Cook pasta according to package instructions then drain leaving a little bit of pasta water in the pot. Cook your chicken sausages if adding the optional protein element.

Meanwhile, combine basil, parsley, cashews, parmesan, garlic, olive oil, lemon juice, salt, and pepper in a food processor or blender. Pulse until everything is minced up and smooth (and resembles pesto).

Add cashew pesto to the pot with the drained pasta then toss until pasta is well coated with the pesto. Divide between bowls then top with extra parmesan (and sliced sausage, if desired).