Preheat your oven to 180°C (350°F) and line a muffin tin with paper liners or lightly grease it.
In a large mixing bowl, whisk together the all-purpose flour, whole wheat flour, baking powder, baking soda, salt, cinnamon, and nutmeg until evenly combined. This creates a fluffy, evenly distributed dry mixture.
In a separate bowl, beat the eggs until frothy, then whisk in the melted coconut oil, brown sugar, and vanilla extract until smooth. The mixture should feel slightly thick and fragrant.
Gently fold the grated carrots into the wet mixture, making sure they’re evenly coated and the batter starts to feel moist and speckled with orange.
Gradually pour the dry ingredients into the wet, folding gently with a spatula or spoon until just combined; do not overmix, as this can make the muffins dense. The batter should be thick but scoopable.
Using a spoon or scoop, divide the batter evenly among the muffin cups, filling each about three-quarters full. The batter will be quite thick but manageable.
Bake in the preheated oven for 20 to 25 minutes, until the tops are golden and cracked slightly, and a toothpick inserted into the center comes out clean.
Remove the muffins from the oven and let them cool in the tin for 5 minutes. Then transfer them to a wire rack to cool completely, allowing the crumb to set and preventing sogginess.
Once cooled, serve the muffins warm or at room temperature. Enjoy their moist, tender crumb with a hint of cinnamon and a gentle sweetness from the carrots.