Combine all ingredients into a glass jar with lid (pint size or bigger), secure lid, and shake vigorously to mix well.

Place in refrigerate for up to 4 days.

When ready to eat, stir contents of jar well, and pour half of oat mixture into a bowl.

Microwave for 20-30 seconds at a time if a warm oatmeal is desired.

Optional: top with a dollop of plain or vanilla Greek yogurt and/or chopped nuts.