Step 1

Line a baking sheet with foil or an 8x8 casserole dish.

Step 2

In a large microwave-safe bowl place the chocolate chips.

Step 3

Pour the sweetened condensed milk over the chocolate chips but do not mix.

Step 4

Add the butter cubes on top of the milk/chips.

Step 5

Microwave on high power for two to three minutes total (depending on the power of the microwave), stirring every 30 to 60 seconds until the butter has almost completely melted.

Step 6

Immediately remove from microwave and stir until well combined.

Step 7

Stir in vanilla and nuts.

Step 8

Immediately pour into prepared dish and spread to your desired thickness.

Step 9

Refrigerate until set.

Step 10

Cut and serve.