Ingredients
Equipment
Method
Prep and mix
- Preheat oven to 350°F and grease a 9x5 loaf pan, then set it aside for the batter. You’re aiming for a loaf pan ready to receive batter right away.
- Whisk all-purpose flour, baking soda, baking powder, salt, cream of tartar, and 1 teaspoon cinnamon together in one bowl until evenly combined. Keep whisking until no clumps of dry ingredients remain.
- Beat granulated sugar, eggs, vegetable oil, sour cream, and vanilla extract until smooth. The mixture should look glossy and fully incorporated.
- Stir in the grated zucchini that has been squeezed dry. Mix just until the zucchini is evenly distributed through the batter.
- Fold the dry ingredients into the wet ingredients until just combined. Stop when you no longer see dry flour streaks to keep the loaf tender.
Bake
- Pour the batter into the loaf pan and sprinkle the cinnamon sugar topping generously over the entire surface. Aim for a thick, even coating so it crackles as it bakes.
- Bake for 50–58 minutes at 350°F until a toothpick comes out clean and the cinnamon sugar top is crackled and golden. Look for a deeply browned, crackled surface and no wet batter on the toothpick.
- Cool the loaf for 15 minutes before slicing. Let it rest until the top sets so the crumb slices cleanly.
Notes
Pro tip: squeeze the grated zucchini very well so the loaf bakes up with a soft interior instead of excess moisture. Store covered at room temperature up to 2 days or in the refrigerator up to 5 days; freeze slices up to 2 months (thaw overnight in the fridge). For a dairy-light swap, use plain Greek yogurt in place of sour cream for a similar tang and moisture.
