Line a 2lb loaf tin (standard size) with greaseproof/parchment paper.
Preheat the oven to about 160C Fan / 180C
Sift your gluten free plain flour, xanthan gum and baking powder into a mixing bowl.
Add the butter, 2 beaten eggs, golden caster sugar and lemon zest to your mixing bowl.
Mix until well combined with an electric hand mixer. It should look lovely and smooth... like cake mix!
Add your milk and mix again very briefly. Your cake mix needs to fall off the spoon when tapped on the side of a bowl. Make sure it is relatively thick.
Spoon your mixture into your loaf tin and bake for 50-55 minutes. Check it is cooked by inserting a skewer and making sure it comes out clean if you need to.
Leave to cool in the loaf tin for a short while before carefully turning out to finish cooling on a cool rack.
Simple and delicious. Enjoy!
Notes
* A madeira cake is very adaptable and works incredibly well for birthday cakes. It works with other flavours too. It's a good recipe to always have on standby!