Love this stuff, love it! Just watch your teeth.
3 cups sugar
1 cup light corn syrup
½ cup water
4½ cups unsalted roasted peanuts
4 Tbsp butter
1 tsp salt
2 tsp vanilla
2 tsp baking soda
Cook the sugar, corn syrup, and water over medium high heat until it reaches 280°. Add the peanuts and stirring continuously, cook to 300°. Remove from heat and stir in the butter, salt, vanilla, and baking soda. The mixture will bubble up because of the baking soda.
Pour the mixture onto 2 parchment lined baking sheets, spreading evenly. Cool then break into pieces. Keeps airtight at room temperature for about a week.