My first posting, hope it helps.

1 1/2 cups sugar
1/2 cup corn syrup
dash salt
2 cups raw peanuts
1 tablespoon butter or margarine
1 teaspoon baking soda
1 teaspoon vanilla extract

Put sugar, corn syrup, 1/2 cup water, salt, and peanuts in 2 quart micro proof bowl or casserole.
Cook on HI for 5 minutes; stir. Cook on HI for 13 to 15 minutes, or until the syrup separates into threads. This is the hard crack stage or 300°F on a candy thermometer. Check temperature with thermometer several times during the last few minutes. (Do not leave thermometer in oven while cooking.) Stir in butter, soda, and vanilla just until light and bubbly. Pour onto buttered cookie sheet. Spread. Cool and break into pieces.

(This was done in a 700 watt oven.)