Combine butter, evaporated milk, sugar and salt in medium heavy saucepan. Bring to a boil over med heat, stirring constantly.
Boil for 4 to 5 mins, stirring constantly. Remove from heat.
Stir in marshmallows, morsels, nuts and vanilla. Stir vigorously for 1 min or until marshmallows are melted. Pour into foil lined 8 inch square pan. Chill till firm. Cut into squares.
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