Combine rolled oats, chia seeds, and sea salt in a 16-ounce glass jar.
Add almond milk, cashew butter, maple syrup, and vanilla extract to the dry ingredients.
Stir thoroughly with a spoon until the nut butter is fully integrated and no dry pockets of oats remain.
Gently fold in the mini chocolate chips.
Seal the container with a tight-fitting lid and refrigerate for a minimum of 6 hours or overnight to allow the oats to hydrate.
Remove from refrigeration and stir once more before serving. Add a splash of milk if a thinner consistency is preferred.