Gluten Free Blueberry Almond Cake

This is a massive hit in the cafe, it's like a frangipani cake, what's not to like?! It's also really easy to make gluten free.

150g butter
150g sugar
3 eggs
Almond extract
100g ground almonds
80g self raising flour (or gluten free self raising flour, I used Doves)
200g blueberries (or any berries that are in season, fresh or frozen)
Large handful flaked almonds
Handful Demerara sugar

Grease and line a 10inch loose bottomed cake tin.
Beat the butter and sugar together until light and fluffy.
Next beat in the eggs and almond extract.
fold in the ground almond and flour.
Pour into the cake tin and sprinkle the blueberries on top, then cover with the flaked almonds and Demerara sugar.
Bake for 30 mins at 170 C until a skewer comes out clean.