1-First, preheat the oven to 350 degrees Fahrenheit and prepare a 9 x 13 inch baking pan by greasing and lining it with parchment paper.

2-In a bowl, whisk together the 2 ½ cups all-purpose flour, 2 teaspoons baking powder, and 1 teaspoon salt; set it aside for later.

3-In a large bowl, beat the 2 cups packed brown sugar and 1 cup room temperature butter with an electric mixer until creamy, then add the 2 large eggs and 1 tablespoon vanilla, mixing well.

4-Gradually add the flour mixture to the wet ingredients and blend until combined, then spread the batter evenly into the prepared pan.

5-In a small bowl, mix the 2 tablespoons sugar and 1 ½ tablespoons cinnamon, and sprinkle this over the batter for that sweet spice topping.

6-Bake for about 25 minutes, or until the edges start pulling away from the sides of the pan.

7-Once baked, let the blondies cool on a wire rack for at least 30 minutes to set properly.

8-Then, for the glaze, whisk together the 1 cup powdered sugar, 2 tablespoons milk, and ½ teaspoon cinnamon.

9-Drizzle it over the cooled blondies and cut them into squares to serve.