Bring a large pot of salted water to a boil over high heat.
Pour the olive oil into a large bowl. Tear the basil leaves into fairly small pieces (about ¼ inch), add them to the oil. Add the Walla Walla Sweet Onions, and cherry tomatoes; stir until they are completely immersed. Season to taste. Set aside at room temperature.
Add the pasta to the boiling water, stir and cook until the pasta is al dente, another 2 minutes. Drain.
Add the pasta to the oil, basil, onions and tomato mixture. Toss thoroughly, then sprinkle with the cheese and toss.