Line an 8×8 square dish with foil, spray lightly with cooking spray and set aside.

For the crust, place the Oreos into the bowl of a food processor and pulse until crumbs have formed. Melt butter in the microwave and stir into the Oreo crumbs. Press well into the bottom of the prepared dish. Refrigerate.

For the filling, place white chocolate chips, butter and peanut butter into a heat proof bowl. Microwave using 30-second intervals, stirring in between until chocolate chips and butter have melted into the peanut butter creating a smooth consistency. Stir in vanilla and powdered sugar. Spread over chilled crust, smooth the top and refrigerate until solid, at least 2 hours. (You could place it in the freezer to speed things up.)

Remove the entire pan of bars by peeling foil away from the dish and lifting up. Cut into 24 squares and top with edible pearls. Refrigerate until ready to serve.