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In a medium saucepan, cook sugars, evaporated milk, syrup, and salt to the soft-ball stage (240 degrees on a candy thermometer).
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Just before removing from heat, add marshmallows, peanut butter, and butter; stirring until well blended.
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Remove from heat and add vanilla, and beat until glossy.
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Then pour into a buttered 8 x 8-inch pan.
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Cool completely before cutting.
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Store pieces in an airtight container.
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Note: The pieces are also good dipped in melted dipping chocolate and sprinkled with finely ground nuts.