Preheat oven to 350 degrees. In large bowl, mix together oats, baking powder, cinnamon and salt. Beat in egg, milk, honey and vanilla. Stir in blueberries. Spray a 9-by-9-inch square baking dish with cooking spray. Add batter and bake for 35 minutes until lightly browned. Let cool slightly on a rack, then cut into six squares.