Baked Pasta And Zucchini

• 1 onion (sliced)
• 1 black pepper (freshly ground)
• 1/2 rotini colored
• 375 gr zucchini
• 300 gr tomatoes (peeled)
• 140 gr potatoes peel thinly
• 120 gr parmesan cheese (grated)
• 110 gr butter
• 110 gr prosciutto
• 9 gr parsley (fresh minced)