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Preheat oven to 350 degrees F. Coat 2 1.5-quart loaf pans with cooking spray.
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Whisk whole-wheat flour, all-purpose flour, cinnamon, baking powder, baking soda and salt in a medium bowl.
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Beat maple syrup, eggs, oil and vanilla in a large bowl with an electric mixer on medium speed until smooth. Beat in butter. Stir in zucchini. Add the flour mixture and stir until just combined. Add the oats stir until just combined. Divide the batter between the two prepared pans. Sprinkle with maple sugar if using.
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Bake until golden brown, puffed and a toothpick inserted in the center comes out with moist crumbs attached, 50 to 56 minutes. Allow loaves to cool in their pans at least 15 minutes before turning out onto a wire rack to cool.