Zucchini-Parmesan Bread

Ingredients

• 1 1/2 c. whole wheat flour
• 1 1/2 c. white flour
• 1/3 c. sugar
• 3 Tbsp. grated Parmesan cheese
• 5 tsp. baking powder
• 1/2 tsp. baking soda
• 1/4 tsp. salt (if desired)
• 1 c. shredded, unpeeled zucchini, squeezed dry
• 1/3 c. butter or margarine, melted and cooled
• 1 c. buttermilk
• 2 eggs or 2 egg whites and 1 whole egg, lightly beaten
• 2 Tbsp. grated onion