Bring a large pot of water to boil, add salt and cook the pasta following the package instructions.
In a large skillet warm up the olive oil and add the garlic and chilli under constant stirring with a wooden spoon for up to one minute, till the flavors come out. Briefly saute the onions until translucent, add the zucchini and cherry tomatoes. Cook everything for about 5-7 minutes and add the parsley at the end. Add extra olive oil for the pasta and serve.