In a mixing bowl, add rolled oats, milk, Greek yogurt, and chia seeds. Then, spoon in peanut butter, drizzle with maple syrup, and toss in vanilla extract with a pinch of salt. Stir everything together until smooth.

Cover the bowl tightly and place it in the refrigerator. Chill for at least 3 hours, or ideally overnight.

Prepare 2-4 mason jars for serving. Spoon about a third of the overnight oats mixture into each jar. Add jam atop the oats.

Top the jam layer with the remaining oats mixture in each jar, pressing down slightly to create a compact layer.

Crown your jars with extra jam and sprinkle some fresh berries or nuts on top if desired. Enjoy straight from the jar or with fresh fruit!