Preheat your oven to 350°F (175°C). Grease a 10.5″ x 3″ (27cm x 8cm) pan and grease it well.
In a medium-sized bowl, whisk together flour, baking soda, baking powder, salt, cinnamon and sugar.
1 1/2 cups (180 grams) whole wheat flour, 1/2 teaspoon baking powder, 1/2 teaspoon salt, 2 teaspoons cinnamon, 1/2 cup (100 grams) brown sugar, 1 teaspoon baking soda
In another medium-sized bowl, lightly beat the eggs. Add honey, oil, vanilla and mashed bananas. Add nuts, if using.
2 large eggs, 1/4 cup (80 grams) honey, 3 tablespoons oil, 1 teaspoon vanilla, 1/2 cup (59 grams) chopped walnuts
Add the wet mix to the dry mix, but just until combined.
If you'd like cinnamon sugar, mix together the optional sugar and cinnamon in a small bowl.
Pourt the batter into the prepared pan and sprinkle the cinnamon sugar over the top, if using.
Bake for 40-45 minutes or until a toothipick nserted in the middle comes out clean. Remember to adjust the time accordingly depending on pan size.
Remove to a rack to cool for 15 minutes before turning out onto the rack to cool completely.
Store in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate it for up to a week or freeze for up to 3 months.