Cooking spray for greasing pan Corn syrup - 1 1/4 cup Brown sugar - 3/4 cup Peanut butter - 1 cup Vanilla - 2 tsp Salt Rice Krispies - 6 cup Butterscotch chips - 8 oz Chocolate - 8 oz Lightly grease a 9-by-13-inch baking pan with cooking spray; set aside. In a saucepan, heat corn syrup and sugar over medium heat, whisking occasionally, until mixture is just bubbling around the edges, about 2 minutes. Slowly whisk in peanut butter, vanilla, and kosher salt until peanut butter