Preheat the oven to 400 degrees Fahrenheit.
Add 3/4 cup boiling water and 1/3 cup cocoa powder to a large mixing bowl, then whisk until dissolved.
Add 1 teaspoon pure liquid monk fruit sweetener, 1 teaspoon vanilla extract, and 1/2 teaspoon salt to the mixing bowl, then whisk well.
Add 1 cup creamy natural peanut butter with no added sugar and 1/2 cup coconut flour to the mixing bowl, then when the mixture is cool enough to handle, use your hands to combine the ingredients until a thick dough is formed (I recommend wearing kitchen gloves to make this easy since the dough will be sticky).
Use your hands to form the dough into 13 evenly sized balls and place them, evenly spaced, on a sheet pan lined with parchment paper.
Use your hands to press the dough balls into flatter circle shapes (these cookies don’t spread in the oven, so you need to flatten them before baking).
Bake for 10 minutes.
Let the cookies cool off for at least 15 minutes before serving.
Optional step: when the cookies have cooled, drizzle melted keto-friendly chocolate on top, then place them in the fridge for 30 minutes, or until the chocolate has hardened, before serving.