Start by grabbing a jar or a container with a secure lid. A 16 ounce mason jar is perfect because it gives you enough room to stir everything together and add toppings later. A simple glass with plastic wrap also works in a pinch!

In your jar, add the 1/2 cup of rolled oats, 1 tablespoon of chia seeds, and a small pinch of salt. The salt is a secret weapon; it enhances all the other flavors, so don't skip it. Give the jar a little shake or stir with a spoon to mix these ingredients together. This step is important because it prevents the chia seeds from clumping at the bottom.

Now, pour in the 1/2 cup of milk, 1/4 cup of Greek yogurt (if you’re using it), 1 to 2 tablespoons of your chosen sweetener, and 1/2 teaspoon of vanilla extract. The Greek yogurt is what gives the oats an incredibly rich and creamy texture, almost like a cheesecake filling.

This is the most crucial step. Use a spoon or a small whisk to stir everything together until it's completely combined. Make sure to scrape the bottom and sides of the jar to ensure all the dry oats are moistened and there are no hidden pockets of chia seeds. You want the mixture to be smooth and consistent.

Gently add the 1/2 cup of blueberries into the mixture. If you're using frozen blueberries, you can add them directly from the freezer. They will thaw overnight and release their beautiful color and sweet juices into the oats. Give it one last gentle stir to distribute the berries.

Seal your jar tightly and place it in the refrigerator. Let it sit for at least 4 hours, but for the best texture and flavor, leave it overnight (around 8 hours). During this time, the oats and chia seeds will absorb the liquid, soften, and transform into a thick, creamy, and delicious breakfast.

In the morning, give the oats a quick stir. If they seem too thick for your liking, you can add another splash of milk. Top with your favorite additions like granola, nuts, or more fresh fruit, and enjoy your effortless, delicious breakfast!