Step 1

Line an 8-inch square baking pan with non-stick foil or parchment, or grease.

Step 2

In a large, microwave-safe bowl, place the chocolate chips and sweetened condensed milk.

Step 3

Microwave for 90 seconds at 70 percent power. Let sit for a couple minutes and then stir very well until completely smooth. (If needed, add additional 30 seconds in microwave).

Step 4

Stir in the dry Jello mixture very well. Fold in the pistachios.

Step 5

Transfer the mixture evenly into the baking pan.

Step 6

Let set several hours at room temperature, or more quickly in the refrigerator.

Step 7

Cut into 16 or 25 squares.

Step 8

Store the fudge in an air-tight container for up to 2 weeks.