I make this peanut brittle every year for Christmas. It is so simple and everyone loves it. No one would ever know it was made in the microwave! You will have to play with the cooking times and adjust them to your microwave. It is also a good idea to have everything measured out before you start so the sugar doesn't harden prematurely.
Easy Peanut Brittle
1 cup sugar
1/2 cup light corn syrup (Karo)
1 Tbsp butter
1 tsp vanilla
1 cup peanuts (I use lightly salted cocktail peanuts)
1 tsp baking soda
Combine sugar and syrup in a microwave safe bowl (I use a glass bowl), stir. Microwave on high for 5 minutes. Add butter, vanilla and peanuts; stir. Microwave on high for 1 minute 25 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. Break into pieces and enjoy!