Place the milk, yeast, sugar, egg and egg yolk, butter, cake flour and salt into a mixing bowl. Combine with a wooden spoon, or the dough hook attachment of a mixing bowl. Knead for 5 – 10 minutes until soft and elastic.
Place the dough into a large, oiled bowl. Cover and set aside to rise for 1 hour.
Knock down the dough and shape into a ball, on a lightly floured surface roll the dough out into a rectangle. Spread the softened butter onto the dough. Sprinkle the sugar and Hinds Spices Cinnamon over the butter.
Roll the dough into a tight sausage and cut into 9 even rounds.
Place the rolls into a baking paper-lined baking tin, cover and set aside to rise for 1 hour.
Preheat the oven to 180°C and bake the rolls for 20 – 25 minutes.
Mix together the glazed ingredients with a whisk and drizzle over the cooled cinnamon buns and sprinkle over Hinds Spices Cinnamon.