01 - In a medium mixing bowl, blend the softened cream cheese, powdered sugar, and vanilla extract until completely smooth and creamy. Gently fold in the fresh blueberries, taking care not to crush them.
02 - Lay out 4 slices of bread on a clean work surface. Divide the cheesecake filling evenly among them, spreading it to within a 1/2-inch border of each edge. Top each with a remaining slice of bread and press gently to seal.
03 - In a shallow dish, whisk together the eggs, milk, granulated sugar, vanilla extract, ground cinnamon, and salt until well combined and uniform in color.
04 - Melt 1 tablespoon of butter in a large skillet or griddle over medium heat, tilting the pan to coat the surface evenly.
05 - Dip each sandwich into the egg custard, coating both sides briefly. Avoid soaking too long or the bread will become soggy. Place the sandwiches in the heated skillet and cook for 3 to 4 minutes per side until golden brown and heated through. Add more butter to the pan as needed between batches.
06 - Transfer to warm plates and serve immediately, topped with additional fresh blueberries, a generous dusting of powdered sugar, and a drizzle of warm maple syrup.