1. Place the filling ingredients in a saucepan and bring to a simmer, whisking whilst it thickens. Once thicken let it cool!
2. Add 1-2 tbsp of the milk tart filling to one slice & add another slice on top, press into the Jaffle maker, and then let it toast for 2-3 minutes on each side. Roll in cinnamon sugar, and enjoy hot with some whipped cream or ice cream!