Preheat oven to 350 degrees F.
Grease a 8x8 baking pan with butter and line with parchment paper. Set aside.
Melt the butter. Set aside to cool.
Sift your matcha powder into a small bowl. Add in all purpose flour and baking powder. Mix well and set aside.
In a large bowl, combine melted butter and brown sugar. Mix until just combined. Add the egg, vanilla extract, and salt. Whisk until combined.
Add your dry ingredients from step 4 to your wet ingredients. Mix until just combined.
Lastly, add in the chocolate chips and mix.
Spoon batter into your prepared baking pan. Smooth it out with your spatula.
Bake for 25-30 minutes until a toothpick comes out clean.
Let blondies cool for 10 minutes before cutting into them