Lite Italian Pasta Salad

Ingredients

• 7 ounces uncooked spiral macaroni
• 2 cups fat free plain yogurt
• 1/2 cup onion, chopped finely
• 1/3 cup Parmesan cheese, grated
• 1 1/2 teaspoons Italian seasoning
• 3/4 teaspoon garlic salt
• 2 medium tomatoes, cut into 1 inch pieces
• 1 medium zucchini, cut into 1/4 inch slices
• 1/2 cup large ripe olives, sliced