In a bowl, mix softened cream cheese, caster sugar, and vanilla extract until smooth. Gently fold in blueberries and set aside.
Slice the brioche into 8 even pieces and create 4 sandwiches with the cheesecake filling between two slices.
Whisk together egg, milk, cream, and cinnamon until smooth.
Dip each sandwich into the custard for 20 seconds on each side, ensuring it's fully coated.
Melt butter in a pan over medium heat and fry each sandwich for 3-4 minutes per side, until golden and crispy.
Top with fresh blueberries, icing sugar, and maple syrup. Serve immediately.