Additional maple syrup, apple slices and cinnamonoptional
Place apples, maple syrup, cinnamon and vanilla in a medium saucepan. Cook over medium heat, stirring occasionally, until apples are tender (3-5 minutes).
Pour in 2 cups water (or milk) and bring mixture to a simmer. Stir in oats and butter. Cook, stirring frequently, until the oats are tender and creamy, about 5 minutes. If the mixture seems too thick, add water or milk while cooking.
Serve warm, topped with additional maple syrup, cinnamon and/or sliced apples.