In a separate bowl, combine the flour, cinnamon, allspice, baking soda, baking powder, and salt, and whisk to combine.
3 cups all-purpose flour, 2 teaspoons cinnamon, ½ teaspoon allspice, 1 teaspoon baking soda, ½ teaspoon baking powder, 1 teaspoon salt
Pour the flour mixture into the egg mixture and beat again until fully mixed. The batter will be thick. Add zucchini and beat once more until incorporated.
2 cups zucchini
In a small bowl, combine the topping ingredients.
1 teaspoon cinnamon, ½ cup granulated sugar
Pour half the batter into the prepared pans and sprinkle with ½ of the cinnamon sugar mixture.
Cover with the remaining batter and sprinkle with the remaining cinnamon and sugar.
Bake at 350°F for 45-50 minutes, or until a knife inserted in the center comes out clean. Allow the bread to cool before slicing.
Notes
When stored in an airtight container in the fridge, snickerdoodle bread lasts at least 1 week. It also freezes well for up to 4 months. Just make sure you store slices in a freezer-safe container or double-wrapped to avoid freezer burn.