In a small bowl, dissolve the lemon Jell-O in the boiling water. Place in the refrigerator.
Prepare the crust. In a bowl or a food processor mix together the melted butter and crushed graham crackers.
Grease a 9x13-inches baking pan with non-stick cooking spray. Transfer the graham cracker mixture to the baking pan. Spread evenly and press down using your palm or the back of a measuring cup. Set aside.
Add the heavy cream to a mixing bowl and beat until light and fluffy using an electric mixer. Set aside.
In another bowl, beat together the softened cream cheese, sugar, lemon juice, lemon zest, vanilla extract, and salt until completely combined.
Slowly add the cooled down Jell-O mixture and beat for about a minute.
Then, fold in the whipped cream by Beating on a low speed until combined.
Transfer the lemon cream cheese filling to the baking pan with the crust. Spread evenly.
Sprinkle a few tablespoons of crushed graham cracker crust over the cheesecake. Refrigerate overnight or at least 2 hours until set. Then, slice and serve.