Preheat oven to 350° F. Prepare cake pans using cooking spray and parchment circles.
In a large mixing bowl, combine granulated sugar, brown sugar, vegetable oil, eggs, milk, and vanilla extract. Using an electric hand mixer or whisk, mix together until fully combined.
Add all-purpose flour, baking soda, baking powder, cinnamon, nutmeg, and salt. Mix together on low speed until the dry ingredients are combined with the wet.
Gently fold in the finely shredded carrots until they are well-dispersed throughout the batter.
Divide batter evenly between your cake pans (see equipment for sizes). Use a kitchen scale to ensure that the batter is equally divided.
Bake cakes for approximately 30-35 minutes in the oven until the cakes spring back when gently touched or toothpick comes out clean. *Please note that baking times may be different for different size pans.
Remove cake pans from the oven and allow the cakes to cool for approximately 20 minutes. Remove the cakes from the pan and transfer to a wire rack to cool completely.
Level cake layers using a serrated knife so that the layers are flat.