Preheat your oven to 350°F (175°C) and prepare an 8.5x4.5 inch loaf pan by greasing it generously and lining the bottom with parchment paper.

In a large mixing bowl, whisk together granulated sugar and dark brown sugar until combined. Slowly drizzle in the oil while whisking.

In a separate bowl, sift together all-purpose flour, baking powder, baking soda, ground cinnamon, all spice, nutmeg, cloves, and salt.

Gradually fold half of the dry ingredients into the wet mixture, then add sour cream and vanilla extract and mix until smooth.

Gently fold in the grated carrots.

Pour the batter into the prepared loaf pan and bake for 65-75 minutes, or until a toothpick inserted comes out clean.

Once baked, cool the loaf in the pan for 10 minutes before transferring to a wire rack.

For the frosting, beat unsalted butter until fluffy, then add cream cheese and mix until smooth. Gradually incorporate powdered sugar and vanilla extract.

Once cooled, frost the loaf and garnish as desired.