Line a standard muffin pan with paper liners, or place liners standing up on a baking tray.
Make the filling. Stir together peanut butter, maple syrup, ¼ cup almond flour and salt until it forms a stiff paste. Add more almond flour if it is still too loose, then refrigerate for about 15 minutes until it is stiff enough to shape.
Shape the filling. Roll heaped teaspoons of the mixture into smooth balls then flatten them in your hands and shape them into little disks or patties with a diameter just slightly smaller than the base of your paper liners.
Melt together dark chocolate and coconut oil until smooth over a double boiler or in the microwave. Spoon about a teaspoon of the melted chocolate into each cup, spreading it out to cover the base and pushing it slightly up the sides to form an edge.
Place a peanut butter patty into the center of the chocolate base, but make sure that the disk is just slightly smaller than the diameter of the base so that it fits in nicely with chocolate all around it. Gently press the disk into the chocolate to help push some of the coating up the sides and around it, but don't let it touch the bottom. Spoon more chocolate over top to cover evenly.
Sprinkle with sea salt and refrigerate until set. Enjoy!