Cook the oats in a reasonably sized pan by boiling the water, then reducing the heat and adding ¾ cup of your almond milk, salt, and oats. Simmer the mixture for 4 minutes.
Once it’s completely cooked, take it off the stove and transfer it to a bowl to cool for about 12 minutes.
Stir in the leftover milk, and add the maple syrup. Cover the bowl with some kind of cling wrap, and refrigerate for the night.
Chop up the plum and toss with a dab of syrup and sprinkle with the cinnamon.