AT A GLANCE
Bitter chocolate and a good pinch of salt in these chewy oat biscuits bring a savoury counterpoint to the milk chocolate filling. If you prefer a less chewy texture, bake them for a little longer. The biscuits and filling will keep separately for up to a week, but it's best to fill them on the day you want to eat them.
|01||For milk-chocolate ganache, stir sugar, lemon juice and 40ml water in a saucepan over medium-high heat until sugar dissolves. Brush down sides of pan with a wet pastry brush to remove sugar crystals, bring to the boil and cook without stirring but swirling pan occasionally until a dark caramel forms (3-4 minutes). Remove from heat, add cream (be careful, mixture will spit), and stir to combine. Add chocolate, return to heat and stir continuously until smooth. Refrigerate until firm.|
|02||Preheat oven to 180C. Beat melted butter, sugars and vanilla in a bowl until well combined (2-3 minutes). Add egg and yolk and beat until pale and creamy. Stir in flour, oats, baking powder and 1 tsp sea salt flakes, then stir in chocolate.|
|03||Spoon heaped tablespoonfuls of mixture onto oven trays lined with baking paper, leaving about 5cm between each to allow for spreading. Flatten slightly, scatter with a little extra salt, then bake until edges are golden (6-8 minutes). Cool completely on trays, then store in an airtight container for up to 2 days.|
|04||Soften ganache briefly at room temperature, then spread thickly over half the biscuits. Sandwich with remaining biscuits and serve.|