Microwave Chocolate Sauce (Wendy and Susan)

Ingredients
12 ounce bag dark chocolate chips
¼ cup evaporated milk
1 ½ tablespoon butter
½ teaspoon vanilla

Directions
Combine all ingredients except the vanilla in the Pyrex container
Microwave on high power for one minute
Add vanilla
Stir vigorously until smooth

Implements
2 cup Pyrex measuring cup, or any microwave safe glass jar
Bamboo chopstick or small wooden spoon, or any small stirring implement
Microwave oven

Comments
Quantities are approximate; experiment for the combination that yields your preferred texture)

Pour over ice cream or fresh fruit. Use as a chocolate fondue dipping sauce. Leftovers, if any, may be frozen.

(adapted from the original stovetop version as introduced by Steven)