Add the Greek yogurt, milk, strawberries, honey, and vanilla to a blender. Blend on high until completely smooth. Adjust to taste with more honey if needed.
Divide the blended mixture evenly among 4 sealable jars. Add 2 tablespoons of chia seeds to each jar. (Alternatively, make one big batch in a large storage container to dish out as needed.)
Stir right away, mixing well to fully incorporate the chia seeds before any gelling begins.
Seal and refrigerate for at least 2 hours or overnight. After 30 to 60 minutes, give each jar one more good stir to redistribute the chia seeds (if you forget, just give them a good stir before eating).
When ready to eat, top with more Greek yogurt or a dollop of whipped cream, diced strawberries, and crumbled graham crackers if using.
