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