01 -
Heat the oven to 350°F (175°C). Line a 9x5-inch loaf pan with parchment paper, leaving overhang on two sides for easy lifting.
02 -
Grate the zucchini on the large holes of a box grater. Wrap it in a clean towel and squeeze lightly to remove excess liquid while keeping the shreds damp.
03 -
In a large bowl, whisk almond flour, coconut flour, baking powder, baking soda, and salt until evenly combined.
04 -
In a separate bowl, whisk eggs, maple syrup, oil, lemon juice, lemon zest, and vanilla until smooth and glossy.
05 -
Stir the wet ingredients into the dry ingredients. Fold in the shredded zucchini, then let the batter rest for 5 minutes so it thickens slightly.
06 -
Spread the batter into the prepared pan and smooth the top. Bake for 50-60 minutes, tenting loosely with foil if needed, until the center is set and a tester comes out with moist crumbs.
07 -
Cool in the pan for 20 minutes, then lift onto a rack and cool completely. Whisk powdered sugar with lemon juice and zest, then drizzle over the cooled loaf.