Peanut Butter Penuche
["2 c. firmly packed brown sugar", "2 c. white sugar", "1 c. milk", "1 Tbsp. white corn syrup", "1/4 tsp. salt", "1/2 c. creamy peanut butter", "2 tsp. vanilla"]
["Butter the bottom and sides of 8-inch square pan.", "In heavy 4-quart saucepan, stir together the sugar, milk, corn syrup and salt."]
["brown sugar", "white sugar", "milk", "white corn syrup", "salt", "peanut butter", "vanilla"]