DirectionsMix the peanuts, sugar, corn syrup and salt together in a microwave-safe casserole dish until well mixed.
Cook in a microwave on high for 4 minutes; open and stir the mix well; then cook on high for another 4 minutes.
Open, stir in the butter and vanilla, then microwave on high for a further 2 minutes.
Finally, remove from the microwave, open the dish, add the baking soda and stir quickly until the mix is light and foamy.
Immediately pour the mixture onto a lightly-greased baking sheet, spreading it out thinly.
Allow the mix to cool - then break it into small pieces and store in an airtight container.
Tip: The trick to making thin, tender peanut brittle is to keep the baking sheet(s) you use warm.
I recommend heating them in a conventional oven at around 200o F (about 95o C) before you spread the peanut brittle mix.
This should allow you to spread the mix 1cm to 2cm thick without it setting up.