Add the flour, cocoa powder, salt and a third of the biscuits ... The middle should be very so slightly gooey. Leave the brownies to cool in the tin - the top will sink and crack a little.
Stir until melted. Beat in the eggs, then stir in the flour and the cocoa powder. Pour the brownie batter into the prepared tin and bake for 30–35 minutes, or until the top of the brownie is ...