To make the filling, combine the raspberries and sugar in a medium bowl. Mix well and set aside to macerate for about 15 minutes. Stir in the cream cheese until well blended.
To prepare the toast, take your loaf and cut four thick slices; making each about 1 1/2-2 inches thick. With a small knife, carefully cut a slit in the top center of each slice to create a pocket, taking care not to cut all the way through to the other side.
In a shallow baking dish or pie plate, whisk together the egg and milk. Whisk in the melted butter and vanilla. Stir in the flour, cinnamon, and salt and whisk until smooth (You'll likely have some flour bits no matter how much you whisk, that's fine!).
Heat a large skillet over medium heat. Fill the pocket of each slice of bread with some of the filling mixture. Place the filled slices of bread in the egg mixture, one or two at a time, soaking about 30-40 seconds per side. Remove the bread to a plate and allow the excess batter to drip off.
Add 1 tablespoon of butter to the heated skillet and swirl to coat. Add the filled slices of toast to the skillet in a single layer. Cook until light golden brown and crisp, about 1-2 minutes per side. Repeat with the remaining slices of bread, adding more butter to the skillet as needed.
Serve immediately with maple syrup, powdered sugar, and fresh raspberries, as desired.