Preheat oven to 350 degrees. Grease an 8 by 4-inch loaf pan and set aside. In the bowl of an electric stand mixer mix sugar with lemon zest for 30 seconds.
Add in oil and eggs and mix until combined. Add the flour, baking powder and salt and blend just until combined. Add in sour cream and 1 ½ tablespoon of the lemon juice and mix just until combined.
Grate zucchini and be sure to squeeze excess liquid out with a towel so bread is not too moist. Add grated zucchini to batter and mix again.
Pour mixture into prepared loaf pan. Bake in preheated oven until toothpick inserted into center comes out clean, about 40 - 48 minutes. Let cool in baking pan for a few minutes then invert into a wire rack to cool completely. Once loaf is nearly cool drizzle with lemon glaze. Store bread in an airtight container.
Lemon Glaze
In a small mixing bowl whisk together powdered sugar and remaining 1 ½ tablespoon lemon juice until smooth (if it seems thin add a little more powdered sugar if it seems thick add a little lemon juice). Drizzle mixture over loaf and let set.
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Notes
How to Store Sweet Zucchini Bread
Cool Completely: Allow the zucchini bread to cool completely after baking. It's important to let it cool down to room temperature before storing to prevent condensation inside the storage container.
Wrap or Cover: Wrap the zucchini bread tightly in plastic wrap or aluminum foil, or place it in an airtight container. Make sure there are no gaps or openings that can allow air in, as air can lead to moisture loss and dry out the bread.
Room Temperature: Sweet zucchini bread is best stored at room temperature. Keep it in a cool, dry place away from direct sunlight and heat sources. A pantry or kitchen cabinet is suitable for short-term storage.
Refrigeration (Optional): If you expect to keep the zucchini bread for an extended period, you can refrigerate it. However, this is not necessary for short-term storage and may alter the texture slightly. If you do refrigerate it, make sure it's well wrapped or in an airtight container to prevent it from absorbing any odors from the fridge.
Freezing (Long-Term Storage): If you want to store the zucchini bread for a longer period, freezing is a great option. Wrap the bread in plastic wrap or aluminum foil, place it in a freezer-safe bag or container, and label it with the date. Zucchini bread can be stored in the freezer for up to 2-3 months. To thaw, simply let it sit at room temperature or warm it in the oven for a few minutes.