Prep the Pan & Mix Wet Ingredients: Preheat your oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or lightly grease with nonstick spray. In a large bowl, whisk together the eggs, milk, melted butter, and shredded zucchini until well combined.
2 large eggs, 3/4 cup (180 ml) whole milk, 6 Tablespoons (85 g) salted butter, melted and slightly cooled, 1 1/2 cups (180 g) packed shredded zucchini (do not squeeze out the moisture)
Add Dry Ingredients: Sprinkle the flour, sugar, baking powder, garlic powder, onion powder, and salt evenly over the wet mixture. Use a whisk to lightly combine the dry ingredients on top before folding them into the wet mixture with a spatula. Stir just until no dry streaks remain—do not overmix. Gently fold in the shredded cheddar until evenly distributed. The batter will be thick.
2 cups (260 g) all purpose flour, 1 Tablespoon granulated sugar, 1 Tablespoon baking powder, 3/4 teaspoon garlic powder, 1 teaspoon onion powder, 1/2 teaspoon Morton kosher salt*, 2 cups (8 ounces) shredded extra sharp cheddar cheese
Fill Muffin Cups: Divide the batter evenly among the 12 muffin cups, filling each about 3/4 full. (I like to use a large cookie scoop.)
Bake & Cool: Bake for 17–19 minutes, or until a toothpick inserted into the center of a muffin comes out clean and the tops are golden brown. Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely or serve warm.