Preheat your oven on 375 F.
In large bowl lightly mix the cream cheese and butter. Add in the egg, milk, vanilla, and lemon juice. Lightly mix. (Make sure the cream cheese is still in chunks)
In a separate bowl sift 1 & 3/4 cup flour, baking powder, and salt. Add in the brown and granulated sugar then stir.
Add the wet ingredients, with the dry and, stir until everything is well incorporated.
In a separate bowl add the blueberries. Dry the blueberries as much as possible, then sprinkle 1 tbsp of all-purpose flour over the berries. Lightly toss the berries, and ensure that all of the berries are coated with flour.
Toss the berries into the muffin batter, and lightly fold in.
Line a muffin pan with paper liners, then fill the with the batter.
Sprinkle the raw washed sugar on top of each muffin cup.
Place in the oven, and let bake for 25 minutes.
Let cool for at least 15 minutes before serving.