Preheat the oven to 325 degrees F (165 degrees C). Grease a 9x5-inch loaf pan.
Combine zucchini, oil, eggs, and vanilla in a blender; pulse until mixture resembles a milkshake.
Whisk sugar, rice flours, cornstarch, tapioca starch, baking powder, cinnamon, baking soda, xanthan gum, and salt together in a large bowl. Stir in zucchini mixture until batter is well blended; pour into the prepared loaf pan.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour. Cool in the pan for a few minutes before removing to cool completely on a wire rack.
While the bread is cooling, make the glaze: Mix confectioners' sugar and lemon juice together in a small bowl to form a thin glaze. Drizzle over the cooled loaf.
Nutritional Facts
Per 10 servings
Calories: 284
Carbohydrate: 42g
Fat: 12g
Fiber: 1g
Protein: 2g
Sugar: 21g
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