01 - Line the bottom of a 9-inch springform pan with parchment paper.
02 - Combine graham cracker crumbs, melted butter, and sugar in a medium bowl. Press firmly into the bottom of the prepared pan. Refrigerate while making the filling.
03 - Sprinkle powdered gelatin over 3 tablespoons cold water in a small bowl. Let stand for 5 minutes to bloom.
04 - Beat cream cheese until smooth. Add Greek yogurt, powdered sugar, vanilla, and lemon juice. Beat until creamy and well combined.
05 - Microwave bloomed gelatin for 15 seconds until dissolved. Cool briefly, then whisk into the cheesecake mixture.
06 - Pour filling over the crust and smooth top with a spatula. Refrigerate for 2 hours until set.
07 - Dissolve fruit-flavored gelatin in 1 cup boiling water, stirring well. Add 1/2 cup cold water and mix. Let cool to room temperature without setting.
08 - Gently pour cooled jello over the set cheesecake layer. Refrigerate for at least 2 more hours until firm.
09 - Run a thin knife around the edge, then release the springform. Garnish with fresh berries if desired. Slice and serve chilled.