INGREDIENTS
1
Egg
1/2 cup
(caster) sugar, fine
1 1/2 cups
All-purpose flour
1/2 tsp
Baking soda
1/2 cup
Brown sugar
3 tbsp
Cocoa powder
2 1/2 cups
Confectioner's sugar
1
Big pinch Salt
4 tbsp
Strawberry milkshake, powder
1 cup
Butter, unsalted
2 tbsp
Whole milk