Line a 9 x 13-inch baking pan with wax paper or baking parchment. Place the corn syrup and sugars in a large saucepan over medium heat and stir to combine. Bring to a boil. Remove from heat.

Stir in the peanut butter and mix well to combine. Quickly stir in the vanilla and Rice Krispies. . Spread into the lined baking pan. Cool and slice into squares.