Coat the inside of a 6-quart electric slow cooker with cooking spray. Place 3 cups water and next 5 ingredients (through salt) in cooker, stirring well. Cover and cook on LOW for 3 hours.
Spoon 2/3 cup oat mixture into each of 8 bowls; top each with 2 tablespoons milk, 2 teaspoons syrup, 3 tablespoons apple, and 1 tablespoon nuts.
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This is one of my favorite CL oatmeal recipes. Sweet enough for us without having to add any sugars. The apple cider and the maple syrup are just enough. I can't imagine making it for guests the morning of with a 3 hour cook time, but I did make it the night before and did like not having to watch over it while it cooked. It reheats really well the next day and a measured serving fills us up all morning.