pre-heat oven to 400°F.

Grease 9x13 baking dish.

Start by making the crust. In a medium bowl stir together the 2 cups of flour, 2 tablespoons white sugar, lemon zest and salt.

Cut in the 1/2 cup THC butter until the mixture resembles coarse crumbs. Beat egg and vanilla together; stir into the crumb mixture until a dough forms. Press into bottom of the prepared pan.

Bake for 12 to 15 minutes in preheated oven, until golden. Remove from oven and set aside to cool slightly.

Sprinkle blueberries over the crust. Combine the 1/4 cup sugar and nutmeg; sprinkle over the blueberries.

Make the topping: In a medium bowl, cream together the 5 tablespoons THC butter and brown sugar until smooth. Mix in flour, so that the mixture is crumbly like streusel. Sprinkle over the blueberry layer.

Bake for 20 to 25 minutes in the preheated oven, until brown. Cool and then dust with confectioners' sugar before cutting into bars.