Melt the butter and almond butter in a microwave-safe bowl. Then stir in the powdered sweetener until well combined.
Add the almond flour, coconut flour, protein powder, and salt. Stir and mix well. If the dough seems crumbly, add water one tablespoon at a time and mix until it holds together.
Add the chocolate chips and mix well. Form the dough into a large ball. Place it on parchment paper, shape it into a rectangle, and cover with another piece of parchment paper. Roll it out flat, remove the top parchment, and transfer to a baking pan.
Melt the 1.5 oz sugar-free dark chocolate and spread it evenly on top of the cookie dough bark.
Freeze for about 1.5 hours, then cut or break into pieces. Enjoy!