Preheat oven to 350°F. Grease an 7x3-inch loaf pan.
Stir the flour, cinnamon, baking soda, salt, nutmeg, and baking powder together and set aside.
Mix the sugar, brown sugar, carrots and egg in a separate bowl. Add the lemon zest (if you are using) and oil to the carrot mixture. Slowly mix in the flour mixture until evenly mixed. Fold in the walnuts.
Pour the batter in the prepared loaf pan. Bake the bread for 55-60 minutes or until a toothpick comes out clean. Let it cool in the pan for 10 minutes than transfer it to a rack to finish cooling.
Notes
I wasn’t sure how many carrots to use in the original recipe so I used 1 cup shredded carrots, which is about 2 medium carrots.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.