Preheat your oven to 200C/180C fan/gas mark 6, and line a 12-muffin tin with cases.
Add all of the ingredients to a large mixing bowl. Using an electric whisk or wooden spoon, mix it together until you get a smooth batter.
Using tablespoons, transfer the batter into each case so they are ¾ full.
Pop the tray in the oven for 13-15 minutes until golden.
Leave to cool before icing. If freezing, do not ice the muffins before you freeze.
To make the icing, add the icing sugar into a mixing bowl along with the lemon juice. If the mix is too watery you can add more icing sugar, or if the icing is too thick add a tiny bit of water at a time until you’ve just a nice thick glossy icing.
Once the muffins are cool, spoon the icing on and top with your favourite sprinkles!
Ready to freeze: If freezing, do not ice the muffins as it will go soggy. Freeze all the muffins in a reusable freezer bag and ice when you want them.
Ready to eat: Remove the muffins from the freezer and leave to defrost for around 45 minutes. Once fully defrosted, make up your icing and spoon on the top.