Form the Crust: Transfer the sticky cereal mixture into the prepared springform pan. Using a greased glass or spatula, firmly press it into the bottom and slightly up the sides to create a sturdy crust. Let it set at room temperature for 15–20 minutes.
Prepare the Filling: In a stand mixer or large bowl, beat the softened cream cheese, sugar, and vanilla until smooth and creamy (about 1 minute). Add the marshmallow crème and mix until fully incorporated. Gently fold in the Cool Whip by hand using a spatula—this preserves its airy texture.
Assemble: Pour the filling into the set crust and smooth the top with an offset spatula or the back of a spoon.
Chill: Refrigerate for at least 2 hours, or until the filling is firm and holds its shape when sliced.
Garnish & Serve: Before serving, pipe or dollop whipped cream around the edge and top with cubed Rice Krispy Treats for a playful finish. Carefully release the springform collar and slice with a warm knife for clean cuts.
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