Grate half of a big zucchini or a whole small one. It should be 360g when grated.
Preheat the oven to 170 degree celcius.
Coat the muffin tray with butter or spray it with oil.
Melt the butter in a pot.
In a mixing bowl add sugar, vanilla extract, eggs.
In a separate bigger mixing bowl add flour, baking soda, baking powder, ginger, nutmeg, salt and mix everything together.
Add the melted butter and grated zucchini to the egg mixture. Don't forget to squeeze the excess moisture from the zucchini before adding it!
Pour the liquid mixture into the dry mixture and mix it together.
Crush the walnuts with your hands or in a grinder and add to the muffin batter. Mix again.
Fill the muffin tray with the batter. I used 1 1/2 tablespoons for each muffin.
Bake for 20-25 minutes in the oven.