Heat butter in a large saucepan over medium heat. Add oats and cook, stirring frequently, until oats begin to smell toasty, about 3 minutes. Add water and salt. Bring mixture to a boil over medium-high heat and then reduce to a simmer. Simmer oats, stirring occasionally, until porridge is thick and creamy and the oats are tender, about 25-35 minutes.
Place warm oatmeal in a bowl. Top with diced apples, almonds and Salted Caramel Sauce. Sprinkle with cinnamon if desired. Serve.