butter or margarine
Heat oven to 350 degrees. Spray bottom of 9x13 pan. In a small bowl combine flour , baking powder and salt. Set aside.
In a large bowl beat butter until cream. Beat in sugars. Gradually beat eggs and vanilla until combined on low speed. Beat in dry ingredients until combined.
Spoon 1/2 batter into the pan and spread evenly. Sprinkle cinnamon/sugar mixture (1TB of each) evenly over batter.
Spoon teaspoons of remaining batter evenly over cinnamon/sugar mixture. Bake 20 to 25 minutes or until golden brown and toothpick comes out clean. Cool completely.
In a small bowl stir glaze ingredients (1 cup powdered sugar, 2 tablespoons milk, 1/2 teaspoon vanilla) until smooth and thin enough to drizzle. Drizzle over bars.