Melt the milk chocolate.
In another bowl, add heavy cream. Whip to soft peaks with a blender or whisk.
In a third bowl, mix yolks with sugar.
In yet another bowl, soften gelatin leaves in cold water.
Add Kahlua and coffee to softened gelatin. Set bowl over hot water bath to dissolve the gelatin.
Fold 1/3 of whipped cream into the chocolate.
Add egg yolks to chocolate. Mix.
Add gelatin mixture to chocolate. Mix.
Fold in the rest of the cream.
Pour mousse in flexipan domes almost to the top.
Place sponge circle (1/4 inch thick yellow cake cut in a circle) on top.
Place in the freezer to set.
Once hard, unmold and place on glazing racks.
Make white chocolate ganache and chocolate ganache.
Put chocolate ganache in a pastry bag. Ladle white chocolate ganache to cover each dome.
Simultaneously, pipe a stripe design of chocolate ganache over the dome (See picture above).
Refrigerate to allow the glaze to set.
Decorate the bottom edge with coffee crunch.
Place a chocolate covered coffee bean on the center of each dome (optional).