Using your stand mixer with the paddle attachment, slowly beat the cream cheese and mascarponse until smooth and combined. Scrape down the sides of the bowl with a rubber spatula. Add the sugar, cornstarch, and cinnamon. Beat for 1 minute, scrape down the sides, and then allow to rest.
Start boiling about 5-6 cups of water.
In a small bowl, whisk the eggs, lemon juice, and vanilla bean paste.
Turn the mixer back on to a low speed and slowly pour in the egg mixture in 3 batches. Wait until just barely combined before added the next pour.
Pour the mixture into the prepared springform pan with the baked crust. Gently drop the pan on a countertop to release any air bubbles that may have formed. Place pan into a large roasting pan. Add boiling water to the roasting pan until the water reaches about half way up the side of the springform pan.
Bake for 1 hour and 5 minutes, or until the edges are set and the center is still wiggly. Do NOT overbake. The center should still move when you shake the pan. Turn off the oven and crack the door. Allow to rest for 1 hour, then remove from oven and carefully lift the springform pan out of the water, discard the aluminum foil. Transfer cheesecake (still in the springform pan) to a wire rack on the countertop to cool for 2 hours. Cover with aluminum foil and place in the refrigerator to chill for 5-8 hours.