Put 1 cup wheat flour, 1 cup white flour, ½ to 2/3 cup sugar, 1 ½ tsp baking powder, ½ tsp baking soda, ½ tsp salt, 2 tsp cinnamon, ¼ tsp nutmeg, ½ tsp ginger and ¼ tsp cloves in a large bowl and whisk. In a separate bowl, blend 1 cup packed grated summer squash, ¼ cup olive oil, 1 egg and 1 egg white, 1 tsp vanilla and ¼ cup plain yogurt. Add the wet ingredients to the dry ones, mix until just blended and put in greased loaf pan. Bake at 350 for 50-55 minutes. And don’t tell anyone about the secret ingredient – at least until they’ve agreed to taste it.