Preheat the oven to 3250F and lightly grease an 8x8 baking dish.
In a large bowl, combine almond flour, Swerve, coconut flour, baking powder, and salt. Stir in melted butter, egg, and lemon zest.
Press the mixture into the bottom and partway up the sides of the prepared pan.
In another bowl, beat cream cheese and softened butter until smooth. Beat in Swerve, egg, lemon zest, lemon juice, and lemon extract. Stir in blueberries.
Pour the filling over the crust. Bake for 30 to 35 minutes until mostly set.
Remove, let cool, then dust with powdered sweetener and cut into bars.