1. Preheat oven to 350° F and line a 9 x 9-inch baking dish with parchment paper.

2. Whisk together the flour, baking powder, and matcha in a large mixing bowl.

3. Stir together the melted butter, sugar, vanilla, egg, and egg yolk in a medium mixing bowl.

4. Add the wet ingredients into the dry ingredients, folding in until just mixed (the batter will be thick). Fold in ¼ cup of the chocolate chips.

5. Pour batter into the prepared baking dish and sprinkle the remaining chocolate chips over the top.

6. Bake for 20-25 minutes, or until an inserted toothpick comes out clean. Remove from oven and rest on a wire rack until completely cool, about one hour.

7. Cut into squares and enjoy! Store remaining bars in an airtight container on counter for up to three days.