Combine 1 cup of rolled oats, 2 tablespoons of chia seeds, and 1 cup of non-dairy milk in a large mixing bowl. Add ½ cup of Greek or Skyr yogurt, 2 tablespoons of pure maple syrup, and a teaspoon of vanilla extract. Mix in 1 diced Honeycrisp apple and 1 teaspoon of ground cinnamon.

Stir the mixture vigorously until well-combined, ensuring the oats are fully coated and the chia seeds are evenly distributed.

Transfer the mixture to an airtight container or cover the bowl with plastic wrap. Refrigerate for at least 2 hours, preferably overnight to allow the oats to absorb the liquid.

Retrieve the oats from the fridge, add a splash of non-dairy milk if desired, and stir before serving in individual bowls or jars.