Ingredients
Equipment
Method
Preheat and prepare the pan
- Preheat oven to 350°F and grease a 9x5 loaf pan so the bread releases cleanly.
Mix dry ingredients
- Whisk all-purpose flour, baking soda, baking powder, salt, cream of tartar, and cinnamon together until evenly combined and free of lumps.
Mix wet ingredients
- Beat granulated sugar, eggs, vegetable oil, sour cream, and vanilla extract until smooth and glossy.
Add zucchini
- Stir in grated zucchini (squeezed dry) until the batter looks evenly speckled.
Combine batter
- Fold dry ingredients into wet ingredients until just combined, stopping as soon as no dry streaks remain.
Top and bake
- Pour batter into the loaf pan and sprinkle the cinnamon sugar topping generously over the entire surface so it forms a thick, crackled crust.
- Bake at 350°F for 50–58 minutes until a toothpick comes out clean and the cinnamon sugar top is crackled and golden.
Cool and slice
- Cool the loaf for 15 minutes before slicing so the center sets and the crust holds its shape.
Notes
For the thick crust, don’t skimp on the cinnamon sugar topping—cover the entire surface evenly. Cool 15 minutes before slicing; serve warm or at room temperature. Store covered in the fridge for up to 4 days (freeze up to 2 months). For a dairy-light swap, use plain Greek yogurt in place of sour cream for a similar tang and moisture.
