1. Combine the wet ingredients: In a blender, add the milk, Greek yogurt, maple syrup (or honey), vanilla extract, and a pinch of salt.

2. Blend until smooth: Secure the lid on your blender and blend the mixture on high speed for about 30-60 seconds, or until all the ingredients are completely smooth and well combined. There should be no lumps from the yogurt.

3. Add the dry ingredients: Pour the blended liquid mixture into a medium-sized bowl or directly into a jar with a lid. Add the rolled oats and chia seeds.

4. Stir thoroughly: Stir the mixture well with a spoon, ensuring that the oats and chia seeds are fully submerged and evenly distributed throughout the liquid. This prevents clumping and ensures even absorption.

5. Cover and refrigerate: Cover the bowl or jar tightly with a lid or plastic wrap. Place it in the refrigerator for at least 4 hours, but preferably overnight, to allow the oats and chia seeds to soften and absorb the liquid, creating that thick, creamy consistency.

6. Check consistency and serve: The next morning, give the oats a good stir. If they are too thick for your liking, you can add a splash more milk to reach your desired consistency. Serve chilled, adding any desired toppings.