Preheat the oven to 325 degrees. Grease and flour two 8 x 4 inch pans.
Sift flour, salt, baking powder, baking soda, and cinnamon together in a large bowl.
Beat eggs, oil, sugar, and vanilla together in a separate large bowl with an electric mixer until combined.
Add flour mixture and beat well. Stir in zucchini and walnuts until well combined. Pour batter into the prepared pans
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 40 -60 minutes. Cool in the pans on a wire rack for 20 minutes.
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Notes
To make the recipe vegan:substitute organic flax seed for eggs - 1 tbsp flaxseed mixed with 3 tbsp water for each egg.