Place your chopped apple into a medium-sized saucepan. If you want your apple to be extra soft (for example if feeding to a young baby) add a splash of water and cook with the lid on for 5 minutes until starting to soften.
Add 75g porridge oats, 50g sultanas (if using) and 1 tsp ground cinnamon to the pan. Stir.
Pour over 500ml milk. Bring to the boil, stirring occasionally, then reduce the heat and cover with a lid. Simmer for 3-5 minutes, stirring often until the apple is soft and the porridge is creamy.
If you want your apple to break down completely you can mash it gently with the back of a wooden spoon or a fork before serving.
Allow to cool a little if serving to a baby or child.
Serve with extra toppings such as chopped nuts or seeds and some maple syrup if wanted.