Step 1

Line an 8x8-inch pan with foil and spray with nonstick spray (or rub lightly with butter).

Step 2

In a large bowl, melt the butter in the microwave (about 40 seconds).

Step 3

Add the chocolate chips and the sweetened condensed milk to the bowl and stir.

Step 4

Microwave again for 30 seconds. Stir again. Repeat 5 more times- microwaving for 30 seconds each time, then stirring after each burst in the microwave.

Step 5

Pour the fudge into the prepared pan and smooth to even in the pan. Refrigerate until firm. Cut into pieces.