Carrot Cake Muffins with Walnut Crumble

Name: Carrot Cake Muffins with Walnut Crumble
Prep time: 15 min
Cook time: 40 min
Total time: 40 min
Yield: 8 portions
Ingredients: 120 g rolled oats; 40 g walnut halves; 2 Tbsp mixed seeds; ¼ tsp ground cardamom; ½ tsp ground cinnamon; 130 g unsalted butter; 70 g light brown sugar; 180 g carrots; 50 g plain flour; 2 medium eggs; ½ tsp bicarbonate of soda; ½ tsp baking powder; 1 pinch fine sea salt