Heat the oil in a pan. Fry the mushrooms over a high temperature while stirring for about 5 min, until golden. Add butter, rosemary and sprinkle with salt and pepper.
Toast the bread slices in olive oil until crisp and golden.
Arrange the Castello Extra Creamy Brie on a dish with some mushrooms, avocado slices and bread. Sprinkle with dried chilli.
Serve in between meals or as a light lunch.