Preheat the oven to 350 degrees F. Grease the inside of a 9-10 inch tart pan, quiche dish, or pie plate, on the bottom and up the sides.
In a medium bowl, combine the sugar cookie mix, butter, and egg with a mixer or fork. Spoon the sugar cookie dough into your tart pan and spread evenly. Press mixture with your fingers or the back of a measuring cup.
Bake for 18-20 minutes, until the top is golden browned and the bottom is no longer raw. Set on a wire rack to cool.
Mix together the cream cheese and granulated sugar with a stand mixer until the cream filling is fluffy. Spread the cream cheese filling mixture into an even layer over the cookie crust. Make sure to go to the sides of the tart pan with the cheesecake.
Pour the sliced strawberries over the cheesecake mixture and spread evenly. In another mixing bowl, combine the strawberry gelatin mix with 1 cup water. Allow the gelatin mixture to soft set for roughly 8-10 minutes, then gently pour it over the strawberries.
Cover and refrigerate for a minimum of 2 hours. Once the gelatin is set, add more whipped cream and garnish with fresh berries. Slice and serve. Enjoy!