Preheat oven to 170°C and place a large baking dish filled with water onto the bottom shelf.
Make sure you have pre-made the Salted Caramel Sauce and that it is cooled, but not set hard from the fridge.
Place all ingredients except Salted Caramel Sauce into the Thermomix bowl in the order listed. Beat 10 sec/speed 6. Scrape down sides of bowl and repeat.
Pour into un-greased rectangular cake tin. Put the cold Salted Caramel into a piping bag with a large round nozzle. Pipe lines down the top of the cake. Use a spoon or skewer to marble the caramel through the cake.
Bake 40-45 minutes until just set in the centre. It will still be gooey due to the caramel sauce, but go with it!
Serve with or without whipped cream or ice-cream. This cake freezes really well.
This is a fabulous family style cake and perfect for after school treats. It freezes really well in portion sizes. Just take the frozen piece of cake from the freezer and pack in a lunch box, it will be perfect by recess or morning tea time!