Grab a large bowl and add the chocolate chips to the cut butter. Set aside.

Now, combine the sugar, milk, and 20 cut frozen marshmallows, then bring to a boil over medium heat.

Boil for 5 minutes, stirring constantly.

Pour this mixture over the chocolate chips and butter mixture. Stir until thick.

Add the nuts, the vanilla, and the frozen marshmallows.

Pour into a buttered 9-inch by 13-inch pan.

Chill until firm. Cut into squares.