Add peanut butter, vanilla, honey and melted coconut oil to a medium mixing bowl and stir to combine.
Add protein powder and flax seed meal. Stir until combined. WIll be the texture of cookie dough as it combines.
Line your 9"x13" baking dish with parchment paper. Dump peanut butter mixture into the lined pan.
Using a rubber spatula or your hand, press mixture into the bottom of the pan and to the edges. Work to get it as even as possible.
Place pan in the freezer for 20 minutes. While this cools, melt your dark chocolate.
Remove chilled dough from the freezer and pour melted chocolate over the top. Using a rubber spatula, smooth the chocolate to cover the entire top of the dough. Allow the chocolate to set for 2-3 minutes before you sprinkle your flaky salt on or it will dissolve.
Place pan back in the freezer for at least 45 minutes before cutting.
Pull up on the edges of the parchment paper to remove bars from the pan. Place on a large cutting board. Cut bars with a sharp chef knife into 24 squaresENJOY!