1. LINE 13x9inch baking pan with foil.
2. COMBINE butter, evaporated milk, sugars, and salt in a medium heavy-duty saucepan. Bring to a full rolling boil, stirring constantly over medium heat. Continue to boil stirring constantly 5 minutes. Remove from heat.
3. Stir in marshmallows, morsels,nuts and extract. Stir vigorously until marshmallows are melted. Pour into prepared pan. Refrigerate until firm. Cut into squares.
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