Lightly butter or oil a 9 x 13 pan. Boil two cups of milk and dissolve 1 cup sugar into it. Mix 1/2 cup cold water with 2 envelopes of unflavored gelatin in a small bowl. Add the gelatin mixture to the warm milk, then combine with sour cream and 2 teaspoons of vanilla extract.
Keep the mixture covered on the counter. Make the first package of Jello, pour it into the cake pan, and refrigerate until slightly tacky. Add 1 1/2 cups of filling, refrigerate until set, and repeat the process with the next Jello package and filling. Keep in the fridge until ready to eat. Enjoy!