three 8-ounce packages cream cheese at room temperature 1 cup granulated white sugar 1/4 cup (1/2 stick) unsalted butter, at room temperature 3 tablespoons cornstarch 4 large eggs 1 cup canned sweetened cream of coconut (such as coco lopez) 1/4 cup coconut rum (such as malibu) 1 1/2 teaspoon