Mix the Oats Base In a mason jar or airtight container, stir together rolled oats, milk, pumpkin purée, chia seeds, vanilla extract, pumpkin pie spice, and maple syrup until well combined.
Make the Cheesecake Layer: In a small bowl, whisk Greek yogurt (or cream cheese), milk, and maple syrup until smooth and creamy.
Layer It Up: Spoon half of the oat mixture into the jar, spread a layer of cheesecake mix over it, then top with the remaining oats.
Seal & Chill: Cover tightly with a lid and refrigerate overnight (or at least 4 hours) to let the oats soak and thicken.
Serve & Enjoy: In the morning, stir gently, adjust consistency with extra milk if needed, then add toppings: crushed graham crackers, cinnamon, and a drizzle of maple syrup.