Stir oats, milk and water together in a large saucepan. Bring to a boil over medium high heat. Reduce heat and simmer for 20 minutes or until desired consistency is reached, partially covered.

While oats are cooking, stir together apples, brown sugar and cinnamon in a small saucepan. Cook over medium low heat until apples are soft, about 10 minutes. Increase heat to medium and cook until liquid reduces and turns syrupy, about 3-5 minutes. Remove from heat.

Oatmeal can be served in one of two ways: Either divide the oats between four bowls and top each portion with a portion of the apple mixture. Or you can stir all of the apple mixture into the pot of oats, and store the whole thing in the fridge to reheat individual portions for a quick breakfast. Serve each portion of oatmeal with 1 Tbsp nuts of your choice, and extra brown sugar and/or maple syrup if desired.