Begin by selecting a medium bowl or a jar for easy storage. Combine the old-fashioned rolled oats, milk (or almond milk), Greek yogurt, maple syrup, vanilla extract, chia seeds, and a pinch of salt. Stir vigorously with a spoon until everything is fully blended and you see a creamy consistency.

Next, fold in the natural peanut butter and mini chocolate chips, along with almond flour if using. Use a spatula to gently incorporate these ingredients, ensuring the chocolate chips and peanut butter are evenly distributed throughout the oat mixture.

Cover the bowl or jar tightly with plastic wrap or a lid. Place it in the refrigerator for at least 4 hours, but ideally overnight, allowing the oats to soak up the moisture.

Once you're ready to enjoy your Cookie Dough Overnight Oats, give the mixture a good stir to combine any separated layers. Consider adding extra toppings—more chocolate chips, a drizzle of peanut butter, or even crushed cookie bits—right before serving.