Tip: This porridge is good at any time of year, not just in the winter. In the summer, try topping it with fresh peaches, nectarines, apricots and berries. In the winter, pears or a dried fruit compote would be fantastic.
Place the oats and milk in a medium-sized bowl and stir to combine, then stir in the mashed banana, grated apple, brown sugar and a pinch of cinnamon. Cover the bowl and place in the fridge overnight.
The next day, transfer the porridge to a pot and set it over a medium heat. Cook, stirring regularly, for 5 to 10 minutes, until the porridge is thick, creamy and piping hot. If it’s getting too thick, though, add another splash of milk.
Divide between two bowls and top with fresh fruit or berries.