Preheat the oven to 350°F (175°C).
In a bowl, mix almond flour and powdered sugar.
Whisk eggs until frothy and combine with the almond mixture.
Fold in the all-purpose flour gently.
Pour into a lined baking pan and bake for 15-20 minutes.
Let the sponge cool completely before cutting into layers.
For the ganache, heat the cream and pour over the chocolate; mix until smooth.
Prepare coffee syrup by mixing brewed coffee and liqueur with sugar.
Assemble layers: soak sponge in syrup, spread buttercream, then ganache.
Repeat layers, finishing with ganache on top and refrigerate overnight.