1.  In a medium saucepan over medium-low heat, melt all the caramel ingredients together until smooth.  Remove from heat.
2.  In a large pot, melt butter over medium-low heat, add the marshmallows and stir until almost melted.   Add vanilla, sea salt and about half of the caramel mixture and stir well.  Remove from the heat and stir in the cereal until evenly coated.
3.  Pour into a greased 9×13 inch pan and press down firmly with damp hands.  Spread the remaining caramel over the top of the bars.  Sprinkle an additional 2 tsp of sea salt flakes over the top and allow to cool before cutting into bars.  If you would like to drizzle chocolate over the top, just melt some chocolate chips in the microwave and drizzle all over!