Preheat the oven to 350 levels F. Butter a Thirteen-by-9-traipse metal baking pan, then line the bottom and aspects with parchment paper; butter the parchment paper. Mud the within of the pan with flour and knock out the extra.

In a dapper microwavable bowl, microwave the butter except it melts, about 1 half of minutes. Add two-thirds of the white chocolate, then shake the bowl so as that the butter covers the chocolate; let stand for 1 minute. Starting from the heart of the bowl, drag the butter and white chocolate collectively slowly except subtle. Add the matcha powder and drag except subtle.

In any other dapper bowl, vigorously drag collectively both sugars, the vanilla, salt and eggs except subtle, lightened in coloration and foamy, about 30 seconds. Inconvenience the matcha mixture into the bowl and drag except subtle. Add the flour and exercise a rubber spatula to fold it in except neutral appropriate incorporated.

Inconvenience the batter into the ready baking pan, spreading it evenly, and subtle the discontinue. Bake except mild brown on top and a toothpick inserted midway between the heart and edges comes out tidy, about 35 minutes. 

Defend away the baking pan from the oven and at present sprinkle the final four oz white chocolate evenly over the discontinue of the “matchies”; let stand for 1 minute. The exercise of a little butter knife or offset spatula, unfold the chocolate evenly over the discontinue, growing swirls and peaks. 

Let the “matchies” cold entirely, then exercise the parchment paper to select them from the pan to a cutting board. Lop them into 24 squares and encourage. Store leftovers in a single layer in an hermetic container for up to 5 days.