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1
Either grease a large cookie sheet or line it with parchment paper or a nonstick baking mat. Get all of your other ingredients ready; you're going to need to add them quickly in a few minutes, and you won't have time to hunt and measure.
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2
Combine sugar, corn or golden syrup and water in a medium saucepan, stirring just until sugar is wet. Attach a candy thermometer and heat over medium-high heat, without stirring, until mixture reaches between 300 and 305 degrees F. If you don't have a candy thermometer, you're looking for a small amount of the mixture dropped into cold water to separate into hard, brittle threads. This takes exactly 9 minutes on my stove.
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3
Remove from heat and quickly stir in butter (until it melts), baking soda, peanuts and pretzels until all are coated. Pour quickly out onto prepared pan. Use a spatula or, even better, two forks to pull and stretch the mixture as flat as you can get it, working quickly. Sprinkle with chocolate chips and let rest for 5 minutes so that they soften. Once they are all soft, use a spatula to spread them over the brittle.
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4
None of us has time or patience for waiting for these to cool, right? I put them directly in the freezer for 20 minutes, after which point the chocolate is firm, the base is cold and I get to bash the brittle into bite-sized chunks. (I like to lift pieces up onto the rim of the baking sheet and use something heavy to break them from there. I do not advise breaking it up with your hands, the warmth of which will make a mushy mess of the chocolate.)
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5
Store in a container at room temperature, far out of your own reach.