Preheat oven to 325 degrees. Lightly grease a 9 x 9 square pan and line with parchment paper.
To make the crust:
Mix all of the dry ingredients in a small bowl and add the melted butter. Stir to combine and press in prepared pan.
Bake for 10-12 minutes. Remove and let cool for 10 minutes.
To make the filling:
Place the cream cheese, eggs, lemon juice, lemon zest and sugar in the bowl of a food processor and mix until thoroughly combined. Using a spatula, scrape into the cooled crust.
Drop blueberries on top.They will sink slightly and sink a little more and burst when they bake.
Bake for 35 minutes or until set in center.
Cool completely and then chill for 3 hours to set.
Remove bars from pan and cut into squares, dust with powdered sugar and serve. Keep leftovers refrigerated.