Mix peanut butter, honey and vanilla in a mixing bowl. You want to use creamy peanut butter to begin with, but if it is not creamy you should melt it prior to mixing.
Once mixed, add the rice cereal to the bowl and mix very well. You want all the rice crisps to be covered in the honey/PB coating.
To a microwave safe bowl, add 1 C of chocolate chunks and 1/2 tbsp of coconut oil. Melt for 2 minutes on medium, mixing halfway.
Line an 8x8 pan with parchment paper and grease with coconut oil spray.
Pour coated rice crisps into the pan and use a greased spatula to press the mixture evenly throughout the pan.
Once chocolate is melted, pour it on top of the rice crisps and use a spoon to cover evenly. Sprinkle some sea salt on top.
Store in the fridge for 1 hour before cutting into squares and eating.