Prepare a baking sheet by lining it with parchment paper. Set it aside where it will be ready for the hot candy mixture.

In a large microwave-safe glass bowl, combine the granulated sugar and light corn syrup. Stir until well mixed. Microwave the mixture for 3 minutes, allowing it to bubble and begin to caramelize.

Carefully stir in the dry roasted or cocktail peanuts and return the bowl to the microwave. Heat for an additional 3 minutes, keeping an eye on it to ensure it doesn't overcook.

Add the butter and vanilla extract to the hot mixture and stir until fully incorporated. Place it back in the microwave for 2 minutes to deepen the flavor and texture.

Remove the bowl with caution, as it will be very hot. Quickly stir in the baking soda. The mixture will foam up as the baking soda reacts, creating the brittle's signature airy texture.

Pour the foamy candy mixture onto the prepared baking sheet. Work swiftly, but do not attempt to spread it, as this can disrupt the texture.

Allow the candy to cool at room temperature for at least one hour, or until it has completely hardened.

Once the brittle is fully set, break it into smaller pieces using your hands or a hard object. Your peanut brittle is now ready to enjoy or share!