Cut the brioche slices into squares.
Cover the base of the pie dish with about ¾ of the brioche squares. Keep the rest back to add another layer later.
Cover the brioche squares with a layer of raspberries and blueberries.
Top with the rest of the brioche squares.
Whisk the milk, eggs, maple syrup, cinnamon and vanilla essence together and pour over the brioche and fruit.
Using the back of a spoon gently press the brioche into the mix to make sure it is covered.
Cover with clingfilm and chill in the fridge for at least 20 mins.
Heat the oven to 180°C.
Once chilled pop the dish in the oven and bake for 30 mins.
After 30 mins check how it is doing and if necessary cover with foil and pop back in for another 10 mins.
Check again and if there is still liquid visible turn down the temp to 160°C and pop back in for another 10 mins.
Leave to sit for 5 mins before serving.
Serve on it's own or with strawberries and grated chocolate, or some Greek yoghurt.