Strong vanilla flavor combined with brown sugar and chocolate is the signature of these rich, moist cookies. The confectioner’s sugar coating gives the finished cookies a dramatic look.
In a bowl, whisk together the flour, baking powder, and salt. In a heatproof bowl set over (but not touching) simmering water, heat the chocolate and butter, stirring frequently, until both have melted and the mixture is smooth, about 5 minutes. Remove the bowl from the heat and let cool slightly.
Add the brown sugar, eggs, and vanilla seeds and vanilla extract