If using a large bar of chocolate, cut it up into small pieces so it melts easily. Also, spread muffin liners out onto a cookie sheet.
Add 2-3 cups of water to the saucepan/double boiler. Turn stove to high. Once the water starts to boil, reduce to medium heat. Add chocolate and coconut oil to the bowl. Stir occasionally to get the chocolate to melt faster.
Once the chocolate is melted, remove from heat. Spoon melted chocolate into muffin liners about ¼-⅓ of the way full (or more if you’d like a thicker peanut butter cup, but not less because the peanut butter will come out the bottom of the cup)
Next, add the peanut butter – about a teaspoon for a mini cup, 2 teaspoons for a standard size.
Once the cups have the peanut butter, add another layer (about a tablespoon) of chocolate on top. The peanut butter will look lumpy, but the warm chocolate will melt it and it will smooth right out.
Lastly, add a pinch of coarse sea salt to the top. I usually break it up with my fingers a little bit so the salt pieces aren’t huge.
Place baking sheet in the fridge or freezer (or outside if it’s winter) to cool for about one hour.
Taste one (or two) and package for gifts!