Use 4 cup Pyrex Measuring cup & short handled wooden spoon - leave in while cooking.
Mix Syrup and Sugar thoroughly. Micro 4 minutes High power Add Peanuts. Micro 3-5 minutes on High or until light brown, usually takes at least 4 minutes - watch carefully.
Add Vanilla and butter. Micro 1/2 - 1 minutes unless brown enough. Take out and sprinkle in soda. Stir well as this makes syrup foamy. Pour on Teflon or well-greased cooking sheet, spread very thin. Let cool and break apart.