Linda's Microwave Fudge

Microwave fudge
3 c. Semi-sweet chocolate chips
1 can sweetened condensed milk
1/4 c. Butter
1 c. Chopped pecans or walnuts
 
Place all ingredients into a 2-quart casserole dish. Microwave at medium until chips are melted (depending on the power of the microwave from 2 to 5 mins).
Check and stir once or twice.
When the chips are melted, stir in nuts and pour into a well-greased 8 x 8 inch square baking dish.
Refrigerate until set and cut into squares.