1 teaspoon vanilla extract or vanilla bean paste, divided
4 ½ ounces (¾ cup) semisweet chocolate chips
4 ½ ounces (¾ cup) white chocolate chips
Directions
Begin the crust: Add the Oreos to a food processor and pulse to fine crumbs. (Alternatively, you can place the cookies in a zip-top bag and crush them using a rolling pin.)
Add melted butter and mix or process to combine.
Line a 10-inch baking pan with parchment paper, leaving an overhang on two sides.
Press the Oreo mixture into the bottom of the pan to form an even crust. You can optionally bake the crust at 350 F for 8-10 minutes and cool completely before proceeding. Otherwise, set the crust aside.
Begin the filling: Whip the heavy cream to medium peaks.
In each of two separate bowls, stir half the cream cheese, half the confectioners’ sugar, half the salt, and half the vanilla to combine.
In separate microwave-safe bowls, melt white and semisweet chocolates until smooth.
Working quickly (or with one at a time), fold white chocolate into one cream cheese bowl and semisweet chocolate into the other.
Quickly fold half of the whipped cream into each chocolate mixture, until uniform.
Spread semisweet chocolate mixture evenly over the prepared crust.
Spread or pipe the white chocolate mixture over the semisweet layer.
Cover and refrigerate for at least 4 hours, or overnight.
Remove the cheesecake bars from the fridge and transfer to a cutting board. Trim away edges if desired.
Use a sharp knife dipped into hot water to cut 16 even bars, wiping the knife in-between cuts.
Garnish bars with a dusting of cocoa powder, chocolate chips, or crushed Oreos before serving.