3 c. chocolate chips - milk chocolate, semi-sweet, flavored or mix to make 3 c.
1/4 c. butter
1 c. sweetened condensed milk (not evaporated)
1/2-1 c. chopped nuts, if desired

In microwaveable dish, combine chocolate chips, butter and condensed milk; microwave at 50% for 3 minutes. Stir, add nuts and microwave for another 3 minutes. Spread in buttered pan, cool 1-2 hours. Cut into squares.