Ingredients
3 cups semisweet chocolate chips
1 (14 ounce) can sweetened condensed milk
1/4 cup butter
1 cup chopped walnuts (optional)
Directions
Place chocolate chips, sweetened condensed milk, and butter in large microwaveable bowl. Zap in microwave on medium until chips are melted, about 3-5 minute, stirring once or twice during cooking. Stir in nuts, if desired. Pour into well-greased 8x8-inch glass baking dish. Refrigerate until set.  Of course, you can also melt the chips in a pot on the stove with your milk and butter, I usually do it this way, but in a pinch, the microwave is quicker.  Enjoy!