Preheat the oven to 350 degrees. Spray or grease bottom only of a 9x13 pan with cooking spray. In small bowl combine flour, baking powder, and salt. Set aside.
In large bowl, beat butter on high until creamy. Beat in sugars. Gradually beat in eggs and vanilla into sugar mixture until combined. In low speed, beat in dry ingredients until combined.
Spoon half of the batter into pan and spread evenly. Sprinkle the cinnamon filling mixture on top. Drop the rest of the batter by teaspoons on top of the cinnamon filling mixture. Bake 20-25 minutes until golden brown or until toothpick inserted comes clean. Let cool for an hour. Drizzle the glaze over the bars.
Updated on March 2, 2020Original Post on September 13, 2012