In a medium-sized mixing bowl, combine the rolled oats, almond milk, maple syrup, ground cinnamon, vanilla extract, and a pinch of salt.
If using, stir in the Greek yogurt until thoroughly combined for an extra creamy texture.
Fold in the chopped nuts and diced apples, ensuring they are evenly distributed throughout the mixture.
Divide the mixture into individual mason jars or airtight containers.
Seal the jars and refrigerate them overnight (or for at least 4 hours) to allow the oats to absorb the liquid and flavors.
In the morning, stir the oats to make them creamy. If desired, add a splash of additional milk for a lighter consistency.
Top with extra diced apples, a drizzle of maple syrup, and a sprinkle of cinnamon before serving.
Notes
Layer the ingredients attractively in the jars for a visually appealing breakfast. Add a sprig of mint or a sprinkle of nuts on top for an extra touch.