Prepare the pan by lining it with parchment paper. For the easiest lining of the pan, wad the parchment baking paper into a ball and get it wet. When opened, it is easily molded into place in the pan.
Make the cheesecake mixture
Grind the Machego cheese or cut it into small pieces.
Add the Manchego cheese and the heavy cream to a saucepan and heat them over low to medium heat, stirring occasionally, until the Manchego cheese has melted into the cream.
Once the Manchego cheese has melted, remove the pan from the heat source and stir in the sweetener (if using) and the cream cheese.
Add in the 4 eggs, stirring them in one by one, until they are all fully incorporated into the mixture.
Baking the cheesecake
Pour the mixture into the prepared pan and place it on a tray in the center of the pre-heated oven.
Bake for 35-40 minutes, checking on the cheesecake after about 30 minutes. If the top is browning too much for your taste, cover the top with some aluminum foil or baking paper.
Once the sides are set, but the center is slightly jiggly, remove the cheesecake from the oven.
Allow the cheesecake to cool to room temperature.
This cheesecake can be served immediately at room temperature. It maintains its luxuriously smooth consistency when unchilled. The cheesecake can also be served cold. Chilling it will result in a denser, more solid cheesecake.
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Notes
Nutritional information is based on the unsweetened cheesecake when cut into 10 slices.