Place shortbread cookies in the bowl of a food processor, and whirl until they turn into fine crumbs of equal size. In a medium bowl, combine the cookie crumbs and butter, stirring until well combined. Press the mixture into the bottom of a 9-inch springform pan. Refrigerate until the filling is ready.
For the filling:
In a large bowl, using an electric hand held mixer or an electric stand mixer, mix the softened cream cheese, powdered sugar, vanilla, and salt until smooth, about 2-3 minutes. Add the sour cream and cream, and continue to mix until the mixture is thickened about, 4-5 minutes. Add the blue matcha powder and gently mix in.
Spread the filling evenly over the prepared crust, and make swirls at the top to mimic waves. Sprinkle with blue and green pearls. Cover the pan with plastic wrap and refrigerate at least 4 hours or overnight.