DIRECTIONS: Heat oven to 375. Grease a 13x9 inch pan. In large bowl, combine flour, sugar, baking powder, salt and lemon peel. Using pastry blender or fork, cut in butter. Add milk, eggs and vanilla. Stir well. Pour 3/4 batter into greased pan.
Top with blueberries. Spoon remaining batter over blueberries. Bake for 35 minutes. Cool 30 minutes. In small bowl , blend icing ingredients. Drizzle over warm cake.