1 c. sugar
1/2 c. white corn syrup

In 1 1/2 quart casserole dish, stir together sugar and syrup. Microwave at High 4 minutes.

Stir in peanuts. Microwave at High 3 to 5 minutes, until light brown. 1 tsp. vanilla extract

Add butter and vanilla to syrup, blending well. Microwave at High 1 to 2 minutes more. Peanuts will be lightly browned and syrup very hot.

Add baking soda and gently stir until light and foamy. Pour mixture onto lightly greased cookie sheet or unbuttered non-stick coated cookie sheet. Let cool 1/2 to 1 hour. When cool, break into small pieces and store in air-tight container.