Microwave first 3 ingredients in a 2 qt glass bowl on high 5 minutes. Stir in peanuts. Microwave 3 more minutes. Stir in butter and vanilla. Microwave 45 seconds or until candy is the color of peanut butter. Stir in baking soda (mixture will bubble). Working quickly, spread hot candy in a thin layer onto a lighly greased baking sheet using two metal forks. Cool completely. Break cany into pieces. Store in an airtight container.
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