For the Cake

• 2 cups all-purpose flour – Forms the base of the cake.
• 1 teaspoon baking powder – Helps the cake rise.
• ½ teaspoon baking soda – Creates a light, tender crumb.
• ½ teaspoon salt – Enhances all the flavors.
• 1 teaspoon ground cinnamon – Adds warm spice.
• ¼ teaspoon ground nutmeg (optional) – Adds subtle warmth.
• 2 large eggs – Provide structure and richness.
• ½ cup granulated sugar – Sweetens the cake.
• ¼ cup brown sugar – Adds moisture and caramel flavor.
• ½ cup vegetable oil or melted butter – Keeps the cake moist.
• ¼ cup sour cream or plain Greek yogurt – Makes the cake extra tender.
• 1 teaspoon vanilla extract – Adds classic flavor.
• 1½ cups grated zucchini – Adds natural moisture.
• ½ cup chopped walnuts or pecans (optional) – Adds crunch.

For the Crumb Topping

• ¾ cup all-purpose flour
• ½ cup brown sugar
• 1 teaspoon ground cinnamon
• ¼ cup cold unsalted butter, cubed – Creates a crumbly topping.

Optional Vanilla Glaze

• 1 cup powdered sugar
• 2–3 tablespoons milk
• ½ teaspoon vanilla extract