Preheat the oven to 190°C (375 F).
Take a crumpet.
To make the topping, to another bowl, add milk powder, cake flour, baking soda, baking powder, icing sugar, and salt. Stir to combine.
Cut in unsalted butter using a fork or pastry cutter. Pour in milk and stir. Add egg yolk to bowl and mix in.
Divide topping into 10 equal pieces, and flatten into semi-circles.
Take one ball of risen dough, and place semi-circle topping on top of crumpet. Spread. Score with a crosshatch to create the ‘pineapple’ look. Repeat until all dough and topping have been used up.
Brush tops of dough with egg yolk.
Bake in oven at 190°C (375 F) for 10-15 minutes.
