1. Preheat oven at 350°.
2. Prepare pan a 8 x 4x 2-inch loaf pan with cooking spray and flour; set aside.
3. In a mixing bowl, combine flour, sugar, cinnamon, baking soda, nutmeg, baking powder & cocoa.
4. In another mixing bowl, combine zucchini, sour cream & egg white.
5. Mix dry ingredients with wet ingredients just until moistened.
6. Pour batter into prepared pan.
7. Bake 60 minutes.