Instructions

1. 1
   Place butter, sour cream, and sugar into a saucepan. Put the saucepan on a stove and cook for 15 minutes over medium heat.
2. 2
   Remove from heat and add vanilla extract, marshmallow creme, and white chocolate chips.
3. 3
   Using a mixing spoon, stir until the mixture is smooth.
4. 4
   Fold in the walnuts and cranberries.
5. 5
   Pour the mixture into an 8x8-inch baking pan.
6. 6
   Put the pan into the refrigerator to cool for 1 hour.
7. 7
   Unmold and cut into 1-inch pieces.