In a large bowl, beat cream cheese and sugar until smooth over medium speed. Reduce speed to low and add sour cream and vanilla. Mix until completely incorporated, scraping down the sides of the bowl as needed.
Always use room temperature ingredients. It helps reduce lumps in the batter and provides for a more even textured cheesecake.
Avoid over-mixing once you add the eggs. Over-mixing creates air in the batter, which when baked and cooled will result in a cracked top. Mix on low speed until the eggs have been completely incorporated, and you should be fine. Giving the prepped cheesecake a few taps on the countertop before baking also aids in removing any extra air bubbles.
For the water bath place a large pan of boiling water in the rack below your cheesecake. This helps create steam in the oven and the cheesecake is able to bake evenly.
When it’s time to turn off the oven, leave the oven door slightly ajar and allow the cheesecake to cool in the oven itself to room temperature. This allows the cheesecake to complete the cooking process and gently cools it down, which avoids creating cracks on the surface.