I don't think I have ever made peanut brittle. I thought this would be foolproof since it is done in the microwave. My first batch burned, but the second batch was great since I stopped and stirred it every minute or so.
1 cup sugar
1/2 cup light corn syrup (Karo)
1 Tbsp butter
1 tsp vanilla
1 cup peanuts
1 tsp baking soda
Combine sugar and syrup in a microwave safe bowl (I use a glass bowl), stir. Microwave on high for 4-5 minutes.(Beth stirred every 1-2 minutes) Add butter, vanilla and peanuts; stir. Microwave on high for 1 minute 30 seconds. Remove bowl from microwave and quickly stir in baking soda.
Immediately pour mixture onto parchment paper, aluminum foil or a Silpat. Spread into a rectangle and let cool for 1 hour.