Optional: Sliced apples, toasted pecans and additional maple syrup
In a 4-qt. slow cooker, combine the first 7 ingredients. Cover and cook on low for 6-8 hours or until liquid is absorbed. Stir in chopped apple. If desired, top servings with apple slices, pecans and syrup.
Boost protein with a dollop of vanilla Greek yogurt (it will help you stay full longer).
Test Kitchen tips
Keep an eye on this as it nears the end of cooking to prevent overcooking at the edges, especially if your slow cooker runs hot.
It's important in this recipe to use steel-cut oats, which need to cook longer than rolled oats. You might find them labeled as Irish oats.