Beat Cream Cheese: In a mixer, beat the cream cheese on medium speed for about 2 minutes until creamy. Scrape the bottom of the bowl.
Add Sweetened Condensed Milk: Mix in the sweetened condensed milk and ricotta. Scrape the bowl again to ensure even mixing.
Add Eggs: Add the eggs one at a time, mixing well after each addition. Scrape the bowl between adding each egg.
Add Flavor: Mix in the vanilla extract and cinnamon until combined.
Pour Batter: Pour the cheesecake batter into the prepared crust.
Prepare Water Bath: Wrap the bottom of the springform pan in foil. Place it inside a larger pan with tall sides. Pour hot water into the larger pan to create a water bath.
Bake: Bake for about 1 hour, until the edges are set, but the center is still slightly jiggly.
Cool Gradually: Turn off the oven and leave the cheesecake inside with the door cracked for 1 hour.
Chill: Remove the cheesecake and let it cool. Then refrigerate it for at least 6 hours or overnight.