Preheat your oven to 175°C (350°F). Grease a loaf pan and line the bottom with parchment paper.

In a large mixing bowl, whisk together the brown sugar, granulated sugar, and oil until well combined. Add in the eggs and mix until smooth.

In a separate bowl, sift together all-purpose flour, baking powder, baking soda, ground spices, and salt.

Gradually fold in the dry ingredients into the wet mixture, alternating with sour cream and vanilla extract.

Gently fold in the grated carrots.

Pour the batter into the lined loaf pan and bake for 1 hour to 1 hour and 15 minutes.

Once baked, cool in the pan for 10 minutes, then transfer to a wire rack.

For the frosting, beat room-temperature butter until fluffy. Add cream cheese and vanilla extract, then mix in sifted powdered sugar.

Frost the cooled loaf and garnish with carrots or nuts as desired.