Preheat the oven to 360 F/ 180 C.
Place all the dry ingredients in a bowl and mix until combined.
Place all the wet ingredients into another bowl (including lemon zest) and mix until fully combined.
Combine the dry ingredients into the wet ones and stir until you have a smooth batter (make sure to not over mix the batter).
Line a 8x8 inch baking pan with parchment paper, and pour evenly the prepared batter into it.
Bake in the oven for 15-20 minutes or until golden on top.
When ready, remove from the oven and allow to rest for 10 mins.
Transfer into a large cutting board, and cut the blondies into squares or your favorite shape.
Whisk the zest and powdered sugar, gradually pour in the lemon juice until you get a thick glaze.
Brush the blondies surface with the lemon glaze.
Allow to set and serve. Enjoy!