In 1 ½ quart casserole, combine sugar and syrup. Microwave at high for 3 minutes.

Add peanuts. Microwave at high 4-5 minutes, until mixture is light brown, stirring every 2 minutes.

Add butter and vanilla; stir well. Add baking soda and gently stir until light and foamy.

Pour mixture onto lightly greased cookie sheet. Let cool 30 minutes to 1 hour.

When cool, break into small pieces. (may substitute almonds or cashews for the peanuts).