It only takes 6 ingredients to make this easy Microwave Peanut Brittle. It’s sweet, salty, crunchy, and a great holiday treat or homemade gift.

Microwave peanut brittle in a clear jar.

Recipe ingredients:

Microwave peanut brittle ingredients in various bowls.

Ingredient notes:

  • Baking soda: Adding baking soda to the hot sugar syrup makes lots of tiny air bubbles that give the candy the porous, honeycomb texture it’s famous for.

Step-by-step instructions:

  1. Line a baking sheet with parchment. Stir together the sugar and corn syrup and microwave on HIGH power for 4 minutes.
    Sugar and corn syrup mixed in a bowl.
  2. Next, stir in the peanuts and microwave on HIGH powered until the picture is a light golden brown. Keep your eye on it during this crucial stage. In most microwaves, this could be anywhere between 3 and 5 minutes.
    Sugar, corn syrup, and peanuts in a bowl.
  3. Then stir in the butter and vanilla and microwave on HIGH until the peanuts are lightly toasted, 1 to 2 minutes longer. The brittle needs to reach the hard-crack candy stage, about 146 degrees to 154 degrees.
    Microwave peanut brittle ingredients mixed together in a clear glass bowl.
  4. Stir in the baking soda. The mixture will get very foamy and lighten in color.
    Microwave peanut brittle in a clear glass bowl with a rubber spatula.
  5. Quickly pour the hot mixture onto the prepared pan and tilt the pan one way and then the other to let the brittle spread out.
    Microwave peanut brittle on a cutting board.
  6. Let cool for 30 minutes before breaking into pieces.
    Microwave peanut brittle on a cutting board.

Recipe tips and variations:

  • Yield: This recipe makes about 1 pound of peanut brittle.
  • Grease the pan: Butter a baking sheet or line it with parchment so the brittle doesn’t stick.
  • Let it flow: Don’t try to spread it with a spatula; just let it flow like lava.
  • Clean-up: Spray the bowl and the spoon or spatula with a non-stick spray before you use them. It will make the hot brittle less sticky and make clean up a little easier.
  • Microwaves: Each appliance is a little different and your results may vary.
  • Storage: Store covered at room temperature for up to 2 months.
  • Chocolate peanut brittle. Sprinkle a layer of semi-sweet chips as soon as you pour the hot brittle onto the pan. Then wait a minute for the chips to melt and gently spread the chocolate over the surface. Amazing!
  • Without corn syrup. Unfortunately, there isn’t a good method for microwave peanut brittle without corn syrup.

Undercooked vs. overcooked peanut brittle.

More holiday treats:

Microwave peanut brittle in a clear jar.

Microwave Peanut Brittle

It only takes 6 ingredients to make this easy Microwave Peanut Brittle. It's sweet, salty, crunchy, and a great holiday treat or homemade gift.
4.97 from 28 votes
Cook Time 10 mins
Cooling time 30 mins
Total Time 40 mins
Servings 8 servings
Course Dessert
Cuisine American
Calories 267

Ingredients 

  • 1 cup granulated sugar
  • 1/2 cup corn syrup
  • 1 cup peanuts
  • 1 teaspoon butter
  • 1 teaspoon vanilla extract
  • 1 teaspoon baking soda (see note 1)

Instructions 

  • Line a large cookie sheet with parchment paper, wax paper, or a silicone mat. In a deep microwave-safe bowl, combine sugar and corn syrup. Mix thoroughly and microwave on HIGH for 4 minutes.
  • Stir in peanuts and microwave on HIGH until the mixture is light brown, about 3 to 5 minutes longer.
  • Stir in butter and vanilla until combined. Microwave on HIGH until peanuts are lightly browned, about 1 to 2 minutes longer.
  • Stir in baking soda until mixture is light and foamy. Pour onto prepared pan and cool 30 minutes. Break into pieces to serve and store in an airtight container.

Recipe Video

Notes

  1. Baking soda: Adding baking soda to the hot sugar syrup makes lots of tiny air bubbles that give the candy the porous, honeycomb texture it's famous for.
  2. Yield: This recipe makes about 1 pound of peanut brittle.
  3. Grease the pan: Butter a baking sheet or line it with parchment so the brittle doesn’t stick.
  4. Let it flow: Don't try to spread it with a spatula; just let it flow like lava.
  5. Clean-up: Spray the bowl and the spoon or spatula with a non-stick spray before you use them. It will make the hot brittle less sticky and make clean up a little easier.
  6. Microwaves: Each appliance is a little different and your results may vary.
  7. Storage: Store covered at room temperature for up to 2 months.
  8. Chocolate peanut brittle. Sprinkle a layer of semi-sweet chips as soon as you pour the hot brittle onto the pan. Then wait a minute for the chips to melt and gently spread the chocolate over the surface. Amazing!
  9. Without corn syrup. Unfortunately, there isn’t a good method for microwave peanut brittle without corn syrup.

Nutrition

Serving: 2ouncesCalories: 267kcalCarbohydrates: 44gProtein: 5gFat: 10gSaturated Fat: 2gCholesterol: 1mgSodium: 159mgPotassium: 136mgFiber: 2gSugar: 41gVitamin A: 16IUCalcium: 22mgIron: 1mg
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Comments

    1. Hi Darrell, I don’t see why you couldn’t use cashews for this. Sounds great! I have tested this with regular salted peanuts and it works great, just watch it carefully so it doesn’t burn. – Meggan

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