Preheat your oven to 175C/350F. Prepare an 8in loaf tin by lining with parchment paper.
Place the almond flour, coconut flour, sweetener, and baking powder in a large mixing bowl. Mix well.
Add the butter, eggs, sour cream, milk and vanilla. Mix into a batter.
Pour into your prepared loaf tin.
Bake for 50 minutes-1 hour, until an inserted skewer comes out clean.
Leave to cool in the tin for 20 minutes before turning out onto a cake rack.
When the cake has cooled, mix together the glaze ingredients and pour over the cake.
Serve straight away, or wait until the glaze has hardened.
