Fast vegie spaghetti

Ingredients

• 500g spaghetti or other pasta
• 2 teaspoons vegetable oil
• 1 small onion, thinly sliced
• 1 small carrot, thinly sliced
• 1 stick celery, thinly sliced
• 1/2 capsicum, seeded and cut into small dice
• 1 small zucchini, cut into small rounds
• 570g tomato based pasta sauce
• 1/4 cup grated Parmesan cheese