Add everything to your jar in the order shown. Basically, oats, anything else that's dry, then wet, then milk. Cover and refrigerate overnight. I make these around 9 or 10 PM and the boys eat them around 6AM. Then the girl eats one around 7:45 if she eats at all. They keep for a few days without getting mushy. I've been told you can heat them in a pan of hot water. I suspect you can microwave them. We eat them cold.
Seriously, you can toss anything in there. I even threw a tiny scoop of probiotic powder in there since my kids refuse to take the chewable probiotics.
I'm thinking raisins in the next batch, and maybe some craisins for my oldest since he prefers them over raisins. Some cinnamon.
I like to cut out processed sugar, but I do let some slide through (ahem, brown sugar) and preserves certainly aren't low in processed or natural sugars either. It's a balancing act.