Preheat oven to 375F.
In a large bowl, combine sugar, oil, egg, & milk.
Blend in flour, baking soda, lemon extract & salt to batter & mix well.
Stir in blueberries.
Pour batter into a buttered 9"x9" pan. Put aside.
In a separate bowl, mix together sugar, apple pie spice, lemon oil and sprinkle evenly over the batter.
Bake for 30 minutes.
Let cool & cut into even sized pieces.