My kids have made this recipe for holiday gifts for years, and the recipients always ask for more.
1 cup raw peanuts
1 cup sugar
1/2 cup white corn syrup
1/2 tsp. salt
1 tsp. butter
1 tsp. vanilla extract
1 tsp. baking soda
Stir together peanuts, sugar, syrup, and salt in a 1-1/2 quart casserole or batter bowl. Place in microwave oven and cook 7-9 minutes, stirring well, after 4 minutes. Color should turn a pale yellow-brown.Add butter and vanilla to syrup, blending well. Return to oven and cook 1 to 2 minutes more. Peanuts will be lightly browned and syrup very hot. Add baking soda and stir as quickly as possible until light and foamy. Pour mixture onto lightly greased cookie sheet, let cool 1/2 to 1 hour. When cool, break into small pieces and store in airtight container.
NOTE: If roasted salted peanuts are used, omit salt and add peanuts after first 4 minutes of cooking.