01 - In a small mixing bowl, beat the softened cream cheese, granulated sugar, and vanilla extract together until completely smooth and creamy. Gently fold in the fresh blueberries, taking care not to crush them.
02 - Lay out all 8 bread slices on a clean work surface. Divide the cheesecake filling evenly across 4 slices, spreading it in a generous, even layer. Place the remaining 4 slices on top to form 4 stuffed sandwiches, pressing gently to seal.
03 - In a wide, shallow dish, whisk together the eggs, whole milk, ground cinnamon, and salt until fully combined and smooth.
04 - Carefully dip each stuffed sandwich into the egg custard, letting it soak for about 10 seconds per side. Ensure both sides are evenly coated but not oversaturated.
05 - Melt the butter in a large nonstick skillet or griddle set over medium heat. Place the soaked sandwiches in the pan and cook for 3 to 4 minutes per side until deeply golden brown and cooked through. Work in batches if needed to avoid crowding.
06 - Transfer the cooked French toast to serving plates. Dust generously with powdered sugar and finish with additional fresh blueberries, a drizzle of maple syrup, or a dollop of whipped cream as desired.