Line an 8X8 dish with foil - spray the foil with a little cooking spray

in a large microwave safe dish, combine the chocolate chips, white chocolate chips, condensed milk, butter, Rum, salt and Vanilla. Microwave on half power for about 2 1/2 minutes - stir.. put back in the microwave for another minute or two.

You want the chips almost completely melted, they will melt the rest of the way while you stir the mixture.

Stir the mixture

Add in the dried cranberries and walnuts

Pour the fudge into your foil lined dish; place in the refrigerator until chilled.

Cut into bite size pieces.