In the bowl of a stand mixer fitted with the whip attachment, whip the heavy cream on high speed until it forms medium-stiff peaks.
Once the heavy cream has been whipped, transfer to a mixing bowl and place on the fridge.
In the bowl of a stand mixer fitted with the paddle attachment, beat the cream cheese on a medium speed until smooth and no lumps remain. Occasionally scraping down the sides of the bowl with a rubber spatula.
Once the cream cheese is smooth, while the mixer is on a low speed gradually add the granulated sugar. Once all the sugar has been added, scrape down the sides of the bowl, then let it mix on medium-low speed for 1 minute.
Next, add the powdered sugar, sour cream, lemon juice, vanilla extract, and vanilla bean paste. Mix on a low speed until combined. scrape down the sides of the bowl.
Remove the whipped cream from the fridge and gently fold the whipped cream into the cream cheese mixture.
Remove the graham cracker crust from the freezer and spread the cheesecake filling into the pan.
Wrap the entire pan with plastic wrap and place in the fridge to chill/set for 8 hours (or overnight is best).
Once the bars have been chilled/set, remove them from pan, and cut into bars!