Zucchini With Ground Beef

• 6 zucchini (sliced)
• 1 onion (chopped)
• 1 green pepper (chopped)
• 1 parmesan cheese (grated)
• 450 gr beef (lean ground)
• 110 gr cheddar cheese (grated)
• 16 ml salad oil
• 1 gr garlic salt
• 1 package pack tomatoes (solid)
• 1 package tomato sauce