Whisk together all the cream cheese filling ingredients in a bowl until the mixture is smooth. Transfer the filling to a piping bag. Make an X-shaped incision in the brioche buns, taking care not to cut all the way through. Pipe the filling into the buns.
Brush the buns with an egg wash and sprinkle a bit more Garlic Bread seasoning over the top. Put them in the oven for 8-10 minutes. Garnish then serve.