Cut the bread into slices and cut each slice into bitesized chunks. Place the bread into a baking tray layering them over each other until the bread is completely used.
In a bowl whisk together the eggs, milk, lemon zest, maple syrup and spices until combined.
Pour the mixture evenly over the bread. Use your fingers to gently press the bread down to make sure it fully soaks up the eggs.
Scatter over the blueberries, cover with cling film, then place in the fridge overnight.
The next morning, pre-heat the oven to 180ºC (350ºF) and bake in the oven for 25 minutes.
Serve as is, or with a dollop of Greek yogurt.