Add apples, maple syrup, and cinnamon to a small pan and bring to a boil over medium-high heat. Lower heat to a simmer and continue cooking until apples are tender, about 5-7 minutes. Set aside to cool.
Whisk almond milk and whey protein until smooth. Add rolled oats, chia seeds, and apple pie spice and mix until combined.
Layer half of the oat mixture into a resealable container or jar, then top with apples, then add the remaining oat mixture. Refrigerate overnight.
Serve chilled or microwave for 1 to 1 1/2 minutes before serving.