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1
Set out the ingredients at least 4 hours before you begin, set the cream cheese, eggs, and sour cream on your kitchen counter because it's essential that the ingredients be at room temperature before you mix the batter.
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2
Position a rack in the center of the oven and heat the oven to 350 degrees. In a medium bowl, combine the graham cracker crumbs and sugar. Stir in the 5 tablespoons melted butter until the crumbs are evenly moistened. Dump the crumbs into a 9-inch springform pan that's about 2-1/2 inches deep and press them firmly into the bottom and about halfway up the sides. Bake until the crust is fragrant and warm to the touch, 5 to 7 minutes; it's fine if the crust start to look golden, but it shouldn't brown too much. Let the pan cool on a rack while you prepare the cheesecake batter.
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3
With a stand mixer fitted with the paddle attachment, beat the cream cheese with the sugar at medium-low speed until the mixture is smooth and somewhat fluffy, about 2 minutes. Scrape the bowl. On low speed, beat in the flour. One at a time, beat in the eggs on low speed, mixing the batter for only 15 to 20 seconds after each egg is added, just until it's incorporated, and scraping the bowl each time. Don't over beat. Add the sour cream, lemon juice, and vanilla. Beat at low speed until well combined, about 30 seconds. The batter should be smooth and have the consistency of a thick-milkshake.
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4
To bake the cake in a water bath, wrap the outside of the pan tightly with two sheets of extra-wide heavy duty aluminum foil to make the pan waterproof. Brush the inside rim of the pan with a light coating of melted butter, taking care not to disturb the crust.
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5
Pour the batter into the prepared crust; it should cover the crust completely and come to within about 1/2 inch of the pan's rim. Put the springform pan in a roasting pan and carefully pour hot water into the roasting pan until the water reaches halfway up the sides of the springform pan. Bake at 350 degrees without opening the oven door for the first hour, until the top of the cake is golden brown and doesn't wobble in the middle when the pan is nudged (a little jiggle is fine), about 1 hour and 10 minutes to 1 hour and 15 minutes. (The cheesecake will be gooey in the middle; don't worry, it will set as it cools.)
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6
Let the cake cool.Remove the cheesecake pan from the water bath, remove the foil wrapping (you may need an extra set of hands for this), and set the pan on a wire rack. Run a thin-bladed knife around the inside rim of the pan to free the cheesecake from the side of the pan. Let the cake cool on the rack until barely warm.
