How to make Peanut Brittle (2024)

FAQs

Why didn't my peanut brittle get hard? ›

The main reason why peanut brittle doesn't get hard and have the crunch we expect is because the sugar was not cooked long enough. The sugar needs to be cooked to what is called the hard crack stage, 300ºF.

Baking soda releases bubbles into our candy (you can see this on a more extreme level in my honeycomb recipe, which uses 5x the amount of baking soda!). This makes the brittle more delicate, crisp, and less chewy, which ultimately makes it more snappy and less likely to obnoxiously stick to your teeth.

#1 - Store in an airtight container

It should come as no surprise that storing your peanut brittle in airtight containers is one of the best ways to store peanut brittle. Keeping air out helps maintain your brittle's freshness by minimizing the amount of moisture that might come into contact with your sweet treat.

If you overcook the brittle, it could be bitter or burnt. If you undercook it, the brittle won't properly set and the end result will be sticky.

I've learned that brittle is better when made on a cool, dry day. When I've made the candy on a warmer, humid day, it tends to be a stickier brittle. This is because the brittle takes longer to cool, and it reaches a point where it is no longer evaporating moisture into the air.

You'll also want to prepare a baking sheet, with either a silicone mat or parchment paper. The mat/paper will help ensure the peanut brittle doesn't stick directly to pan once it has cooled.

To store: Store peanut brittle (once it's completely cooled) in an airtight container at room temperature. Do not refrigerate as the moisture from the fridge will cause the brittle to soften. Store for 6-8 weeks. To freeze: Peanut brittle can be frozen and stored up to 3 months.

As the sugar is cooking and begins turning amber in color it accumulates small amounts of acid, and that acid reacts chemically with the alkaline baking soda releasing about a zillion minuscule bubbles of CO₂ that get trapped, making the sugar porous and, well… brittle.

When candy cools slowly on a stone slab, more crystals have a chance to form. With a higher number of micro-crystals, the sugar has more sites on which to crystallize, and so crystallization ultimately happens faster.

Can peanut brittle go bad? ›

How Long Does Peanut Brittle Last? Properly stored (in an airtight container at room temperature), peanut brittle will last one to two months.

If your peanut brittle is too soft, you didn't cook it long enough.

How long does it take for peanut brittle to harden? This microwave peanut brittle starts to harden almost immediately once you finish cooking it and stirring in the baking soda. It will be completely hardened and ready to break into pieces in just 30 minutes.

The main reason is that your Fudge has not reached the optimum temperature. If your mixture only reaches 110 or 112 degrees Celsius it will always be soft. That's why we recommend investing in a sugar thermometer. Another reason your Fudge is not setting is that the ratio of liquid to sugar is too high.

Peanut butter is naturally high in fat, but that fat is nearly solid at room temperature. In order to soften it up, you need some heat. In my case, I heated two tablespoons in a heat-proof bowl and then stirred like crazy.