Step 1

Line a large baking sheet with aluminum foil and spray it with nonstick cooking spray. Set aside.

Step 2

In large microwave safe glass bowl, stir together the sugar and corn syrup.

Step 3

Microwave the mixture for 4 minutes. The sugar will boil. Carefully add the peanuts and butter and use a heatproof utensil to stir to combine.

Step 4

Return the bowl to the microwave and cook for an additional 3 to 5 minutes - or until caramel colored. The mixture will need to reach between 300 and 310°F - the hard crack stage.

Step 5

Remove from the microwave and add the vanilla and baking soda and stir quickly to combine. The mixture will foam up. Stir just enough to get all the baking soda combined, but don't over stir. The bubbles/foam is what give the brittle the lighter honeycomb texture and stirring too much will work all those out of the mixture.

Step 6

Quickly and carefully pour the mixture onto the prepared pan. Use a silicone spatula sprayed with nonstick cooking spray to spread the brittle evenly. Allow to cool completely before breaking into pieces. Store in an airtight container.