1. Preheat your oven to 375 degrees Fahrenheit. Prep a nine-inch round pan with baking spray and line the bottom with Gefen Parchment Paper.
2. In a large bowl, combine the sugar and lemon zest until fragrant. Add the remaining ingredients, except for the blueberries, until you have a cohesive batter. Stir in the blueberries. Pour into your prepared pan.
3. In the same bowl, combine the sugar and lemon zest until fragrant then add the remaining ingredients and mix until crumbs form. Scatter the crumbs over the top and bake for 45 to 55 minutes. Cool completely and dust with confectioners’ sugar before serving, if desired.