Preheat the oven to 350°F (180°C) and grease two 9 or 10-inch round springform cake pans.
In a medium mixing bowl, combine sieved coconut flour, cocoa powder, sweetener, baking powder, and salt.
In a large mixing bowl, beat the eggs with coconut oil and vanilla extract until foamy.
Add in the dry ingredient mix and combine well.
Mix in the zucchini.
Spread out into the two pans. Bake both sponge cakes for 30 to 40 minutes. NOTE: After 30 minutes, check for doneness every 5 minutes until a toothpick inserted in center comes out clean.
Cool on a wire rack.
Almon crunch (optional)
Combine the coarsely ground or chopped almonds with sweetener.
Roast in a pan, stirring continuously until golden brown.
Set aside to cool.
Chocolate filling
Melt dark chocolate chunks and let cool down. The chocolate must still be runny before use.
Combine ripe avocados, melted chocolate, almond milk, vanilla extract, salt, and sweetener in a food processor or blender until completely smooth.
Blueberry topping
Soak one package of gelatine in ¼ cup water or blueberry juice for a few minutes.
Blend blueberries and sweetener in a high-speed blender.
Place the blueberry mixture and the soaked gelatine into a pot. Bring to boil, constantly stirring.
Cool to room temperature before use.
NOTE: Use double the amount of blueberries if you don't mind a little extra carb.
Assembling and finishing the cake
Place one of the sponge cakes into a cake springform pan.
Evenly spread roasted almonds on top of the first sponge cake.
Spread the chocolate filling on top of roasted almonds and cover with the second sponge cake.
Pour the blueberry topping over the second sponge cake.
Cover and refrigerate for a few hours, ideally overnight.