In a large mixing bowl, combine rolled oats, milk, almond butter, maple syrup, vanilla extract, cinnamon, and salt. Stir well until all ingredients are fully incorporated.
Fold in mini chocolate chips and chopped nuts if using.
Divide the mixture evenly into four jars or containers with lids.
Seal the jars and refrigerate overnight (or at least 4 hours) to allow the oats to soak and soften.
In the morning, give the oats a good stir and add a splash of milk if desired for a creamier texture. Enjoy cold or heat in the microwave for 30-60 seconds if you prefer it warm.