Carrot, apple and brazil nut muffins

Ingredients

• 2 cup wholemeal self-raising flour
• 1 teaspoon ground cinnamon, plus 1/4 teaspoon extra
• 1/2 cup brown sugar, plus 1 tablespoon extra to sprinkle
• 36 cup brazil nuts, chopped
• 1 cup green apple, grated, plus 1 extra
• 1 (1/2 cup) finely grated carrot
• 125 gram melted, cooled butter
• 3/4 cup milk
• 2 eggs
• 1 teaspoon vanilla extract