Preheat the oven to 350° F.
Cut out the center of each Hawaiian roll, and place them in a baking dish.
In a small bowl, combine the cream cheese, ricotta, and lemon curd extract smooth. Gently fold in the blueberries.
Stuff 1 heaping Tablespoon of the cream cheese mixture into the center of each Hawaiian roll, and top with extra blueberries, if desired.
In a second small bowl, whisk together the milk, eggs, and vanilla extract. Pour the mixture evenly over the Hawaiian rolls.
Place aluminum foil over the rolls, and bake covered for 35-40 minutes. Remove the foil, and bake for an additional 5 minutes.