Ooh, ours is super easy, and so yummy!
3 cups semisweet chocolate chips
12 ounces sweetened condensed milk
1/2 cup nuts, any kind
1 tablespoon Grand Marnier
1 teaspoon vanilla
Mix chocolate chips and sweetened condensed milk in a large microwave safe bowl at medium heat until melted. Stir to melt in any remaining lumps. Add nuts, brandy and vanilla. Mix thoroughly to ensure that the nuts bind with the fudge. Smooth it all out onto a piece of wax paper. Refrigerate until cooled, about 1 hour. Cut into squares.
You can get different results using different types of chips. The better the chips, the better your fudge. We like to sometimes used dark chocolate chips. And I've substituted other liqueurs (like Kahlua) for Grand Marnier if it wasn't easily accessable (i.e. I was too lazy to get a stool or chair to reach it at the back of the cabinet.)