Place the mini muffin liners in the mini muffin pan.
Fill a pot with 1" of water, and heat over medium heat on the stove. Place a glass mixing bowl on top of the pot of water to create a double boiler setup. (Make sure that the water in the pot does not touch the bowl).
Place the 100% dark chocolate, coconut oil, almond butter, maple syrup, vanilla extract, and sea salt in the mixing bowl. Stir occasionally.
As the water under the bowl begins to simmer, you will start to see the coconut oil and chocolate slowly melt. At first, the ingredients will be separated. But once the chocolate melts completely, the mixture will all come together.
Make sure to not get any water from the pot in the chocolate mixture. It will seize up!
Once the chocolate mixture is completely melted and unified, fill the mini muffin liners halfway with the chocolate. Then, place a 1/2 tsp dollop of peanut butter in the center of each one. Allow the peanut butter to sink into the chocolate a bit.
Then, cover the peanut butter with more chocolate, filling each muffin liner up to the top.
OPTIONAL: Top the chocolate cups with a sprinkle of flaked sea salt or crushed up freeze-dried strawberries.
Place the mini muffin pan in the freezer or refrigerator to allow the chocolate to cool completely and set.
Store the chocolate peanut butter cups in the refrigerator or freezer to keep from melting.
Enjoy these decadent healthy homemade chocolate peanut butter cups!