Mini Vanilla Muffins with Marshmallow Frosting

Name: Mini Vanilla Muffins with Marshmallow Frosting
Prep time: 15 min
Cook time: 8 h
Total time: 8 h
Yield: 24 pieces
Ingredients: 160 g unsalted butter; 140 g caster sugar; 3 eggs; 40 g self-raising flour; 110 g plain flour; ½ tsp vanilla extract; 1 tbsp milk; 450 g whipping cream; 400 g marshmallow; 100 g icing sugar