Pre-heat oven to 350 degrees. Line a 9x13 inch baking sheet with parchment paper.
Combine all dry cookie ingredients, then add wet ingredients and mix until just combined. Pour into prepared baking sheet and spread evenly. Bake for 12-15 minutes or until a toothpick inserted into the center comes out mostly clean.
Whisk peanut butter whip ingredients together until smooth. Spread evenly over cooled cookie.
Spread melted chocolate on top of peanut butter whip. Refrigerate for 5-10 minutes, then sprinkle with large flake sea salt. Once the chocolate has just hardened, cut into bars. Store in the refrigerator.