Spray a cookie sheet pan with non-stick cooking spray. Combine the sugar and corn syrup in a large, microwave safe bowl. Microwave on high power for 4 minutes. Stir in the peanuts with a sprayed spoon. Microwave the peanut mixture on high power for 3 more minutes. Add the butter and vanilla and stir. Microwave on high power for 1 ½ more minutes. Add the baking soda, and gently stir until the mixture is light and foamy.

Pour the peanut brittle mixture onto the prepared cookie sheet and allow the brittle to cool 1 ½ hours. Break the brittle into small pieces and store in an airtight container.