Preheat oven to 160C.
Line and oil 1 x loaf pan the bottom with Baking paper (oil the sides and bottom ) only line the bottom
In a large bowl, sift and combine the flour, baking soda, baking powder, and cinnamon.
Add the salt
In a stand mixer whisk the eggs and both sugars until thick and light in color.
Add the oil slowly and whisk to combine.
Fold in the grated zucchini.
Pour the wet mixture into the dry including the walnuts, then stir until just combined.
Add the batter into the prepared loaf pan and spread it into an even layer.
Bake for 55 to 60 minutes- the top should spring back and not sound wet.
Check not to over bake - a skewer inserted into the center of the loaf comes out clean.
Or You can check with a thermometer the inside should reach 85C.
Let the loaf cool in the pan for 5 to 10 minutes. Then, turn them out onto a cooling rack to cool completely.