Super Moist Carrot Cake

Name: Super Moist Carrot Cake
Prep time: 25 min
Cook time: 55 min
Total time: 1 h 20 min
Cuisine: British
Ingredients: 2 large eggs (room temperature); 100 g dark brown sugar; 75 g granulated sugar; 50 ml buttermilk; 175 ml vegetable oil; 230 g plain flour; 1/2 tsp baking powder; 1/2 tsp bicarbonate of soda; 1/4 tsp salt; 1 tsp cinnamon; 1/2 tsp nutmeg; 220 g carrots (finely grated); 100 g raisins (juicy, plump); 50 g unsalted butter (softened); 50 g cream cheese (room temperature); 1 tsp vanilla extract; 150 g icing sugar