Make chocolate sandwich cookies
Preheat the oven to 180°C/160°C (fan)/gas mark 4. Lightly grease a baking tray with butter and line it with parchment paper. Mix the butter, sugar and 140g of chocolate spread together in a large bowl using the hand mixer. Beat in flour and cocoa powder. Add egg and beat again until the mixture is smooth. Leave to chill in the fridge for 20 minutes. Divide the dough into 20 even-sized pieces, roll each piece into a ball and flatten the balls into discs with the palm of your hand. Put one teaspoon of chocolate spread in the middle of half the discs and put the other 10 discs on top, to make them into sandwiches. Gently pinch the edges of the sandwiches to ensure that the spread is sealed inside and won’t spill out. Lay the sandwiches on a baking tray. Leave plenty of space between each one. You may need two baking trays. Bake for 12–15 minutes, or until the sandwiches are firm around the edges and set in the middle.
The cookies have a delicious filling.