Preheat and prep: Heat oven to 350°F (175°C). Line a muffin tin with paper liners or lightly spray with oil. For strict portion control, use a small standard muffin tin or a mini muffin tin.
Whisk dry ingredients: In a medium bowl, whisk flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger until evenly combined.
Mix wet ingredients: In a large bowl, whisk the egg, applesauce, oil, brown sugar, maple syrup, and vanilla until smooth.
Make sure there are no sugar lumps.
Add the carrots: Fold grated carrots into the wet mixture. If using optional add-ins, sprinkle them in now. Keep amounts small to stay under 100 calories.
Combine: Add dry ingredients to wet.
Stir gently with a spatula until just combined. Do not overmix; a slightly lumpy batter is fine.
Portion: Fill each muffin cup about 2/3 full. For standard tins, aim for smaller muffins to keep calories down. For minis, about 1 heaping tablespoon per cup works well.
Bake: Bake mini muffins for 10–13 minutes, or small standard muffins for 14–17 minutes.
They’re done when a toothpick comes out clean or with a few moist crumbs.
Cool: Let muffins cool in the pan for 5 minutes, then move to a rack. Cooling helps set the crumb and keeps them tender.
Optional finish: Dust lightly with cinnamon before serving for extra aroma without extra calories.