Step 1

Lightly grease a 9-by-thirteen-scoot baking pan and line with parchment paper, leaving a 1-scoot overhang. In a medium bowl, microwave 1 1/2 cups of the bittersweet chocolate chips 
in 30-2d bursts till perfect melted; hurry till relaxed. 
Drag within the remainder 1/2 cup of bittersweet chocolate till melted. Spread in an even layer within the ready baking pan.

Step 2

In a diminutive bowl, trail the matcha powder with the 
1 1/2 teaspoons of oil. In a neatly-organized bowl, microwave three 1/2 cups of the white chocolate chips in 30-2d bursts till perfect melted; hurry till relaxed. 
Drag within the remainder ½ cup of white chocolate till melted.

Step three

Mix 1/2 cup of the melted white chocolate with the matcha till no streaks live. Scatter neatly-organized spoonfuls of the matcha chocolate and the white chocolate over the dusky chocolate layer and, working snappy, utilize a diminutive spatula to decoratively swirl the matcha chocolate with the white chocolate. Sprinkle with the sesame seeds. Let stand at room temperature till firm, 2 hours. Desire away the bark from the pan, lower into pieces and help.