Cooking spray for greasing pan 1 1/4 cup light corn syrup (11 1/2 ounces; 324 g), such as Karo 7 1/2 ounces brown sugar (215 g; about 3/4 cup loosely packed) 9 ounces (255 g; 1 cup) creamy peanut butter (commercial or natural varieties will both work well) 2 teaspoons (10 ml) vanilla extract 1 teaspoon (4 g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight 6 cups (180 g) rice crisp cereal such as Rice Krispies 8 ounces (225 g)
