Line a baking sheet (8 x 8 inch) with paper and preheat the oven to 350°F (180ºC).
Mix flour, baking powder and salt in a bowl.
2 ½ cups all-purpose flour, 2 teaspoons baking powder, 1 teaspoon salt
In another bowl, mix the butter and sugar and cream it with the help of an electric mixer. It should take about 5 minutes, the mixture should be soft and creamy.
2 cups brown sugar, 1 cup butter
Add the egg and vanilla extract and mix for a couple more minutes.
2 eggs, 1 tablespoon vanilla extract
Add the dry ingredients to the mixture and combine with a spoon or spatula, don’t over mix, just until fully combined.
Transfer the mixture to the prepared plan. Mix the sugar and cinnamon and sprinkle on top of the mixture.
2 tablespoons sugar, 1 tablespoon cinnamon
Bake for 35-40 minutes, or until a stick comes out clean.
Mix the glaze ingredients. Let the blondies cool and top with the glaze. Cut in squares.
2 tablespoons milk, 1 cup powdered sugar
Serve and enjoy!