1. Preheat oven to 400°.
2. Weigh or lightly spoon flours into dry measuring cups; level with a knife. Combine whole-wheat flour and next 6 ingredients (through salt) in a large bowl; stir with a whisk. Combine zucchini, milk, oil, honey, and egg in a small bowl; stir until blended. Make a well in center of flour mixture; add milk mixture, stirring just until moist. Spoon batter into 12 muffin cups coated with cooking spray.
3. Combine 1 tablespoon sugar and 1/4 teaspoon cinnamon; sprinkle over tops of muffins. Bake at 400° for 15 minutes or until golden. Remove from pans immediately; cool on a wire rack.
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