Preheat your oven to 350°F (175°C) and prepare a loaf pan by greasing it.

Grate the zucchini using a box grater, yielding about 1 to 1.5 cups, and squeeze out excess moisture.

In a mixing bowl, whisk together flour, sugar, baking soda, baking powder, salt, and cinnamon.

In another bowl, beat the eggs and mix in vegetable oil and vanilla extract until smooth.

Gradually combine wet and dry ingredients, mixing just until combined without overmixing.

Fold in the grated zucchini and any optional mix-ins, ensuring an even distribution.

Pour the batter into the greased loaf pan, filling no more than ¾ full, and smooth the top.

Bake for 45 to 55 minutes until golden brown and a toothpick comes out clean.

Cool in the pan for about 20 to 30 minutes, then transfer to a wire rack to cool completely.