Preheat oven to 160°C. Generously butter a 20cm square tin with a removable base, and set aside.
Place condensed milk, butter, vanilla paste and salt into the Thermomix bowl and melt 4 min/60°C/ speed 1.
Add all dry ingredients (except chocolate chips) and blend 10 sec/speed 7. Scrape down sides of bowl and repeat.
Add chocolate chips and blend 6 sec/speed 6. Fold through raspberries with a spatula.
Spread mixture into prepared tin and bake in the oven for 25 minutes. Turn off oven, but leave the brownies in the oven for a further 5 minutes. If topping with chocolate, place a few chocolate chips on the surface of the brownies while still hot. Allow to melt slightly and then spread with a palette knife.
Alternatively dust generously with icing sugar.