Preheat oven to 350 degrees. Prepare an 8-inch square pan with non-stick spray. For presentation and easy release, you can line the pan with foil and spray with the non-stick spray.
In a bowl, break up all of the cookie dough and combine the dough, flour and lemon zest. Knead the mixture until all of the flour is well combined into the dough.
Take your prepared pan and line the bottom with a little more than half of the dough mixture. Bake for 15 minutes.
While baking, mix together the blueberry spread and 1 tsp of the lemon juice in a small bowl.
When the base is done baking, spread the blueberry mixture on top. Then, crumble the remaining cookie dough mixture and place all over the top.
Bake for 25 minutes, until the top is golden brown. Cool completely.
In a small bowl, combine the remaining lemon juice and powdered sugar. If the mixture is too thick, you can add a little more lemon juice to get the consistency that you prefer.
Drizzle all over the top of your cooled bars, cut and enjoy!