Preheat the oven to 350°F (175°C) and grease a muffin tin.

In a mixing bowl, combine the dry ingredients: flour, baking powder, baking soda, cinnamon, and salt.

In another bowl, mix the wet ingredients: grated zucchini, vegetable oil, sugar, eggs, and vanilla extract until well combined.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.

Bake in the preheated oven for 20-25 minutes or until a toothpick inserted into the center comes out clean.

Allow the muffins to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.