Preparation Steps:

• Start by crushing the 15 Oreo cookies in a blender or by placing them in a zip-top bag and using a rolling pin to crush them into fine crumbs. In a mixing bowl, combine the crushed Oreo cookies with 3 tablespoons of melted butter. Mix until fully incorporated.
• Press the Oreo crust mixture firmly into the bottom of a 7-inch springform pan to create an even layer. Set aside.
• In a large mixing bowl, beat the 2 packages of cream cheese until smooth using a hand mixer. Gradually add in 1/2 cup of white granulated sugar, continuing to mix until well combined. Add 1 tablespoon of cornstarch and mix thoroughly.
• Add the 3 large eggs one at a time, mixing well after each addition. Then, pour in 1/2 cup heavy cream and 1 teaspoon of vanilla extract. Mix until the batter is smooth and creamy. Gently fold in the 10 chopped Oreo cookies.
• Carefully pour the cheesecake filling over the prepared crust in the springform pan, smoothing the top with a spatula.
• Add 1 cup of water to the Instant Pot's inner pot. Place the trivet inside and carefully lower the springform pan onto the trivet.
• Close the lid of the Instant Pot, ensuring the valve is set to the sealing position. Set the Instant Pot to manual high pressure for 35 minutes. Once the cooking time is up, allow the pressure to release naturally for 10 minutes, then quick release any remaining pressure.
• Once the cheesecake is done cooking, carefully remove it from the Instant Pot. Allow it to cool at room temperature for about 30 minutes before refrigerating for at least 4 hours or overnight for best results.
• To prepare the topping, melt 1 cup of white chocolate chips in a microwave-safe bowl. Stir until smooth and let cool slightly. In another bowl, whip the 1/3 cup of heavy whipping cream until soft peaks form. Gently fold the melted white chocolate into the whipped cream until fully combined.
• Once the cheesecake has chilled, remove it from the springform pan. Spread the white chocolate topping over the cheesecake and garnish with the remaining 8 chopped Oreo cookies. Slice and enjoy your Instant Pot Oreo Cheesecake!