Cook the pasta according to the package instructions. Salt the water and cook the pasta in boiling water.

Once the pasta is just shy of reaching al dente, add 1-2 ladlefuls of the pasta water to a pan, and dissolve your pesto. Transfer the pasta to the sauce, and finish cooking it in the pan. You can add some more pasta water when needed. 

When the pasta is al dente, check for seasoning, and add salt and pepper as needed. For more depth and creaminess, add some of the nutritional yeast and olive oil and incorporate it into the sauce.  

To plate the dish, add some pasta to a plate. Add a few additional spoonfuls of sauce, and dress the pasta with it. You can use some of the reserved olive oil, nutritional yeast, black pepper, and sea salt to finish the dish! Using some fresh herbs to garnish can be a nice touch as well.