Flourless berry sponge is my go-to sponge recipe. You can vary the berries and bake as a cake, a slice or as cupcakes. Why not add some lemon zest to the mixture too?
Mix the melted butter, coconut flour, sweetener, vanilla and baking powder together until smooth.
Add the eggs one by one, mixing in between each addition.
Pour into a prepared baking dish, I use a silicon cake dish.
Press each frozen berry evenly into the cake. This allows the berries to be evenly distributed and not clump together. It also stops the cake from turning pink!
Bake at 180C/350F for 20-25 minutes until cooked in the centre.