1. To make the syrup, the brown sugar and water in a saucepan under low heat. Bring to a simmer and stir until all the sugar has been dissolved.
2. In a blender, mix Selecta Super Thick Classic Vanilla, milk, and bananas. Blend until fully combined and smooth.
3. To serve, drizzle the brown sugar syrup on the inside of a tall glass. Pour in the milkshake mixture to fill. For optional garnish, top with whipped cream and cookie crumbs to serve.