Blueberry Lemon Crumb Bars. Stir butter and brown sugar in medium bowl until smooth. Method 1Preheat the oven to 375 degrees F 190 degrees C.
Carefully fold in blueberries making sure to coat the berries evenly. In a medium mixing bowl combine sugar cornstarch vanilla lemon juice and zest. Bake 20 to 25 minutes until browned.
In another bowl stir together the sugar cornstarch and lemon juice.
Blueberry Crumb Bars. Sprinkle the blueberry mixture evenly over the crust. To prepare the filling. Pour the blueberry mixture over the crust.