Preheat the oven to 330°F. While that's warming up, put the almond flour, coconut flour, a ⅓ of the melted butter (or coconut oil) in a mixing bowl and mix until you form a dough.
Transfer the dough to an 8x8 inch baking pan that is lined with parchment paper and press the dough into a flat layer on the bottom of the pan. It should be about a half inch in thickness.
Bake this for 10 minutes or until it turns golden brown.
While that's baking, combine the peanut butter, a ¼ cup (60 gr) of melted butter (or coconut oil), and a ¼ cup (60 gr) of maple syrup, and mix until well combined.
Cool the crust from the oven for at least 10 - 15 minutes. Then pour the peanut butter sauce on top and spread it over the crust evenly. Place it in the freezer for 1 hour, or until the peanut butter has hardened.
Once hardened, remove the whole thing from the baking pan and cut it in half with a sharp knife. Keep cutting the pieces in half until you have 16 bars.
Melt the chocolate over a double boiler with a tablespoon of vegetable oil (or coconut oil). Dip each bar into the melted chocolate and set them to dry on a tray lined with parchment paper. Before the top part dries, sprinkle some salt to taste.
Freeze for 10 minutes to set the chocolate and enjoy.
Notes
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.