Crush the oatmeal cookies into fine crumbs using a food processor or a rolling pin.
Melt the butter and mix it with the oatmeal cookie crumbs. Press the mixture evenly into the bottom of a springform pan and refrigerate for 30 minutes.
Dissolve the gelatin in cold water according to the package instructions, then let it stand.
In a large bowl, combine the cream cheese, sugar, and vanilla extract until smooth.
Heat the heavy cream over low heat, but do not boil. Add the dissolved gelatin and mix well.
Pour the cream and gelatin mixture into the cream cheese mixture and mix thoroughly.
Pour the cream over the prepared oatmeal cookie crust. Spread evenly, then refrigerate for at least 4 hours to set.
Garnish the cheesecake with fresh fruit or chocolate shavings, then slice and serve.
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