Microwave Peanut Brittle
["1/2 c. firmly packed light brown sugar", "1/2 c. granulated sugar", "1/2 c. light corn syrup", "1 c. unsalted peanuts", "2 Tbsp. unsalted butter", "1/4 tsp. salt", "3/4 tsp. baking soda", "1/2 tsp. vanilla"]
["Spray cooking sheet and icing spatula with nonstick vegetable oil cooking spray."]
["brown sugar", "sugar", "light corn syrup", "peanuts", "unsalted butter", "salt", "baking soda", "vanilla"]