Once water is boiling rapidly, add pasta and cook as per instructions on box/packet
While pasta is cooking, in a fry pan, place green beans and 2 tablespoons of pasta water. Cook until just tender
By this time the pasta should be cooked. Just before draining the pasta, reserve 1 Cup of the water and set aside.
Add pasta and pesto to pan and stir through until pasta is coated well. At this stage, if you find the pesto is cooked, add a tablespoon of pasta water until you reach the desired consistency – smooth but not runny.Note: If you're throwing in some left over roast chicken, do so here :)
Place the spinach in the pan and stir through until just wilted.
Add in the nutritional yeast and pumpkin seeds and stir through.
Season with salt and pepper.
Serve and top with extra nutritional yeast and pumpkin seeds.