Start by making your crust. Combine the graham cracker crumbs, granulated sugar, and melted butter in a medium bowl and stir until the mixture resembles wet sand. Press this firmly and evenly into the bottom of a 9-inch springform pan — use the flat bottom of a measuring cup to really pack it in there. Pop the crust into the freezer while you work on the filling.

Now grab your stand mixer or a hand mixer and beat the softened cream cheese on medium speed for about 2 minutes until it's nice and smooth with no lumps remaining. Add in the powdered sugar, vanilla extract, lemon juice, and lemon zest, then mix again until fully combined and creamy.

In a separate bowl, pour in your cold heavy whipping cream and whip it on high speed until stiff peaks form — this usually takes about 3 to 4 minutes. You'll know it's ready when the cream holds its shape and doesn't flop over when you lift the beaters.

Gently fold the whipped cream into the cream cheese mixture in two or three additions. Take your time here and use a rubber spatula with a light hand to keep as much air in there as possible. This is what gives your cheesecake that light, mousse-like texture.

Spoon the filling over your chilled crust and smooth the top out evenly with an offset spatula or the back of a spoon. Cover the pan with plastic wrap and refrigerate for a minimum of 6 hours, though overnight is even better if you can wait.

While the cheesecake is setting, make the blueberry topping. Add the blueberries, granulated sugar, and lemon juice to a small saucepan over medium heat. Stir and cook for about 5 minutes until the berries start to break down and release their juices. Mix the cornstarch with the cold water in a small bowl to create a slurry, then pour it into the blueberry mixture and stir constantly for another 2 minutes until it thickens up. Remove from the heat and let it cool completely before using.

Once your cheesecake has fully set, carefully release the springform pan. Spoon the cooled blueberry topping over the cheesecake right before serving, or let people add their own portion at the table. Slice, serve, and enjoy every single bite!