Preheat the oven to 200 celsius and prepare 12 muffin liners

Whisk together the flour, baking powder, salt, and cinnamon

Take the egg and separate the yolk and egg white. Beat them separately until the yolk is creamy and the white has turned into snow

Whisk together the yolks and whites and then slowly procceed to add the sugar, buttermilk, oil and extract and whisk until combined

Slowly add the dry ingredients to the wet and fold in the grated carrots

In a small bowl, whisk together the flour, sugar, cinnamon and melted butter to create the crumb topping

Spoon the muffin batter into the muffin liners and top with the crumb topping

Bake for around 15 minutes, or until a toothpick inserted into the centre comes out clean

Whisk together the mascarpone and sugar until there are no lumps

Cut the muffins open and fill with mascarpone/spread the mixture on top