Prepare a heatproof container with water and sprinkle gelatin over it to let it bloom. Line the mold with parchment paper.

Place Oreo cookies and butter in a plastic bag, crush finely, and mix well. Press the mixture firmly into the mold and refrigerate to set.

Microwave the bloomed gelatin uncovered for 20 seconds at 600W.

Cut pumpkin into bite-sized pieces, remove seeds and skin, and microwave for 4 minutes at 600W. Add cream cheese and mash until smooth.

Mix sugar and heavy cream into the pumpkin mixture until smooth, then add the melted gelatin and mix well. Pour into the mold and refrigerate for 3 hours until set.