Chocolate Sandwich Cookies

Ingredients

• 115g butter
• 170g caster sugar
• 2 tsp vanilla extract
• 110ml milk
• 210g plain flour
• 95g cocoa powder
• 2 tsp cornflour
• 1/2 tsp salt
• 1/4 tsp baking soda
• Filling: 55g butter, 55g shortening, 340g icing sugar, 1 tsp vanilla

Method

1. Cream butter and sugar until pale, then stir in vanilla and milk.
2. Flour, cocoa, cornflour, salt and soda in, mixed to a dough that holds together.
3. Divide into four and roll each between two sheets of baking paper to 5mm. Rolling between paper means no extra flour, which keeps them dark.
4. Cut 5cm rounds, re-rolling the scraps.
5. On trays 1cm apart. 170°C for 12 minutes.
6. Five minutes on the tray, then cool completely.
7. Beat the filling until very pale and stiff, pipe onto half the cookies, press the rest on top.