Begin by stirring together the plain Greek yogurt, peanut butter, vanilla protein powder, maple syrup or honey, and vanilla extract until you achieve a smooth and creamy consistency. Spread this mixture evenly on a parchment-lined quarter sheet pan.

In another bowl, melt the dark chocolate chips by microwaving them in 30-second increments, stirring between each session. Once melted and smooth, pour it evenly over the peanut butter yogurt mixture.

Transfer the assembled bark into the freezer and allow it to chill for at least 2-3 hours until fully set.

After freezing, remove the bark from the freezer and sprinkle it with flaked sea salt if desired.

Using a sharp knife, cut into pieces or simply break it apart with your hands for a more rustic look.