01 - Combine rolled oats, milk, yogurt, Biscoff spread, maple syrup or honey (if using), vanilla extract, and salt in a medium bowl. Stir thoroughly until completely smooth and well incorporated.
02 - Divide the oat mixture evenly between two jars or airtight containers, ensuring each container receives an equal portion.
03 - Cover containers tightly and refrigerate overnight for a minimum of 6 hours, allowing oats to fully absorb liquid and develop flavors.
04 - Stir oats thoroughly in the morning. Top with crushed Biscoff cookies, drizzle with melted Biscoff spread, and add fresh banana or berries if desired. Serve chilled.