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 the mixture is completely smooth and well incorporated.
02 - Divide the oat mixture evenly between two jars or airtight containers, ensuring each container receives an equal portion of the mixture.
03 - Cover containers securely and refrigerate for a minimum of 6 hours, preferably overnight, allowing the oats to fully absorb the liquid and develop rich flavors.
04 - In the morning, stir the chilled oats thoroughly. Top each portion with crushed Biscoff cookies and drizzle with melted Biscoff spread. Add fresh banana slices or berries if desired. Serve chilled.