Combine all ingredients except the toppings in a small glass jar. Cover with a lid or plastic wrap. Place in the refrigerator for at least 2 hours or overnight.
Uncover the next day and stir well. Top with some fruit or nuts.
Notes
Overnight oats can be stored in the fridge for up to 5 days so you can make a batch for the week.
You can adjust the sweetness level by adding or taking away maple syrup in tablespoon increments.
If you want warm oats, heat in the microwave for 45-60 seconds, or until warmed through.
Stir the oats just before eating as the oats at the bottom are a little more slushy.