Prepare the Crust: In a bowl, combine the graham cracker crumbs, 1/4 cup of sugar, and melted butter until the mixture resembles wet sand. Press this mixture firmly into the base of a greased springform pan to form the crust.
Make the Filling: In a large mixing bowl, beat together the softened cream cheese and 1 cup of sugar until smooth. Stir in the vanilla extract and sour cream, and mix well to combine.
Incorporate the Eggs: Add the eggs to the mixture one at a time, making sure to mix well after each addition. This will ensure a silky texture for your cheesecake.
Add the Strawberry Flavor: Fold in the strawberry puree gently, taking care not to overmix. This will provide the lovely strawberry flavor without losing the creaminess.
Bake in the Instant Pot: Pour the filling over the prepared crust in the springform pan. Pour 1 cup of water into the Instant Pot, place the pan on a trivet, secure the lid, and set to high pressure for 40 minutes.
Release and Cool: Once cooking is complete, allow the pressure to release naturally for 10 minutes, then quick release the remaining pressure. Carefully remove the cheesecake and let it cool to room temperature before refrigerating for at least 4 hours.
Add the Topping: Just before serving, sprinkle the crushed strawberry crunch cereal on top for that signature crunch!