Preheat your oven to 180°C (350°F).
Prepare your baking sheets with parchment paper.
In a bowl, whisk the eggs and sugar until pale and fluffy.
Fold in the almond flour and all-purpose flour gently.
Add melted butter and coffee, mixing until just combined.
Evenly distribute the batter onto prepared sheets.
Bake for 10-12 minutes until golden.
Cool the cake layers completely on wire racks.
Prepare the coffee buttercream by beating butter until creamy.
Add powdered sugar and coffee extract and mix until combined.
Assemble by spreading the buttercream between layers.
Prepare ganache by melting dark chocolate and mixing in butter.
Pour ganache over the assembled cake and smooth out.
Chill in the refrigerator to set.
Slice and serve, garnishing as desired.