Peel and finely chop the onions. Fry in a pan with oil until translucent. Wash the zucchini, grate finely and add to the onions in the pan and sauté gently. Add the broth. Coarsely chop the cheese and stir in. When the cheese is completely dissolved, season with salt and pepper. Wash, chop and stir in the basil.
Cook the pasta in plenty of salted water until al dente, drain and mix with the sauce.