Preheat and prepare pan. Preheat oven to 350℉ (177℃). Position a rack in the center of your oven and preheat the oven to 350°F. Lightly grease a 9 inch by 5 inch loaf pan. I like to line mine with parchment paper as well and grease lightly again.
Shred zucchini. Using a box grater, shred the zucchini. Then measure out 2 cups. Then place the zucchini in a paper towel or clean dish towel and squeeze out the excess water. Place zucchini in small bowl and set aside. 2 cups shredded zucchini
Combine dry ingredients. In a mixing bowl, whisk together flour, salt, baking powder, garlic powder, onion powder, and black pepper. Stir in cheese and chives. 2 ¼ cups (270 g) all purpose flour ½ teaspoon salt 4 teaspoons baking powder 1 teaspoon garlic powder ⅛ teaspoon black pepper ½ teaspoon onion powder 1 ½ cups shredded cheddar cheese 3 Tablespoons fresh, chopped chives
Combine wet ingredients. In a second mixing bowl, whisk together eggs, oil, and milk and sour cream. 2 large eggs ½ cup (120 ml) oil ¼ cup (57 g) sour cream ½ cup (120 ml) milk
Combine wet and dry ingredients. Add the dry ingredients to the wet ingredients and mix together with a spatula until just combined. Fold in zucchini.
Bake. Bake in a preheated 350℉ (177℃) oven for 50-60 minutes until a toothpick inserted into the middle of bread comes out clean or with a few moist crumbs clinging to it (no wet batter) and top springs back to the touch when lightly touched. Remove from the oven and cool completely in the pan on a wire cooling rack.