Place corn syrup and sugar into a large pot.

On stove top cook over medium heat, stirring frequently, until sugar dissolves and mixture just begins to boil.

Remove from heat. Stir in peanut butter. Mix well. Add Rice Krispies. Stir until well coated.

Press the peanut butter mixture into an even layer into a 13 x 9 baking pan coated with cooking spray or parchment paper. Set aside.

In the microwave, melt chocolate and peanut butter chips together in a medium microwave-safe bowl, stirring every 30 seconds. Heat just until melted. Don't over heat!

Spread melted chocolate and peanut butter chips evenly over the cereal mixture. Sprinkle with flake sea salt, if desired.

Let stand until firm. Cut into small squares when cool.