Ingredients
2 cups granulated sugar (400g)
1 cup light corn syrup (240mL)
½ cup water (120ml)
½ teaspoon salt
¾ cup butter cubed and softened to room temperature (170g)
2 cups dry roasted peanuts (260g)
1 teaspoon vanilla extract
1 teaspoon baking soda
Instructions
Lightly grease a large baking sheet (13×18”) with butter. Line it with parchment paper and lightly butter the paper. Make sure all of your ingredients are measured out and ready to go before you start.
In a medium, heavy-bottomed saucepan with tall sides (at least 4-quarts), stir gently to combine the sugar, corn syrup, water, and salt. Scrape the sides of the pot with a rubber spatula to clean any sugar off the sides. Clip a candy thermometer on the side of the pot (making sure that it doesn’t touch the bottom). Place the pan over medium heat.
Bring the mixture to a boil, gently stirring occasionally until the sugar is fully dissolved, for 6 to 10 minutes, until it reaches 250°F.
Immediately add the butter and stir constantly until it melts. Let the mixture return to a boil.
Cook for another 12 to 15 minutes, or until the mixture reaches 280°F, then stir in the peanuts. Cook, stirring slowly but consistently, until the temperature reaches 305°F.
Remove the pan from heat and immediately add the vanilla and baking soda. Stir well to combine. (The mixture will bubble up quite a bit, so don’t be alarmed.) Immediately pour the mixture onto the prepared baking sheet and quickly spread it out using a spatula. The brittle should completely cover the sheet pan and be thinner than the peanuts embedded in it.
Allow the brittle to cool completely, about 45 minutes, before breaking into pieces.