Easy Microwave Fudge

1 (12 oz.) pkg semi-sweet chocolate chips (2 cups)
1 (14 oz.) can sweetened condensed milk
1-1/3 cup chopped walnuts
1 teaspoon vanilla extract

Directions:
Combine chocolate chips and condensed milk in a large glass microwave bowl. Microwave on high for three minutes. Stir until chocolate is completely melted and smoothly combined with milk. Stir in vanilla extract and walnuts. Spread into a foil lined 8x8" pan. Chill until set.

Notes:
Do not use evaporated milk in this recipe.