Chicken And Vegetable Casseroles

• 2 chicken breast hlves
• 1 onion
• 1 tomato
• 190 gr zucchini
• 6 gr pitted ripe olives (sliced)
• 5 gr margarine
• 1 gr snipped parsley
• 1 gr snipped basil (fresh)
• 1 gr garlic powder