3/4 cup butter
1/3 cup granulated sugar
1/2 cup light brown sugar
1/3 cup white sugar
1/4 teaspoon salt
1 egg
1 tablespoon light corn syrup
1 teaspoon vanilla extract
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch jellyroll pan. Melt butter in small saucepan over low heat. Stir in the granulated sugar, brown sugar and white sugar. Mix until all ingredients are well blended. Place corn syrup in small saucepan. Stir in vanilla.
Spread peanut butter mixture evenly over jellyroll pan. Bake in preheated oven for 40 minutes. Remove from oven and spread warm peanut butter in warm oven. Check sauce on a swizzle stick. If it is still warm, cover the pan and allow to cool.