Preheat your oven to 350°F (175°C) and spray a 9 x 5 inch bread pan with non-stick spray.

Grate about one medium zucchini and squeeze to remove excess moisture.

In a large bowl, whisk together 2 cups of flour, 2 teaspoons of baking powder, 0.5 teaspoon of baking soda, and 1 teaspoon of salt.

In a separate bowl, mix 1 cup of milk with 1 tablespoon of vinegar and let it sit for 5 minutes, then whisk in 0.25 cup of melted butter and 1 egg until smooth.

Fold the wet mixture into the dry ingredients until just combined.

Fold in the grated zucchini, 1 cup of cheddar cheese, and 0.25 cup of green onions until just mixed.

Pour the batter into the prepared bread pan and smooth the top.

Bake in the preheated oven for approximately 60 minutes, or until a toothpick comes out clean.

Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool for at least 30 minutes before slicing.