You want to sweeten the nut butter first. Use both or simply one of the sweetener choices I provided. Depends on how sweet you'd like it.
If you add the powdered sweetener this will cause the peanut butter to stiffen. If you don't use it you may want to stick in the refrigerator or freezer for about 10-20 minutes. See recipe notes below why to do this...
Melt half the chocolate either in the microwave in 30 second intervals or the double boiler way. After chocolate has melted remove from heat and add in the other half. Allowing the heat to melt the remaining chocolate
In silicone muffin cups (highly recommended) or paper liners pour 1/2 teaspoon to cover the bottom. spread around and pop in freezer 2-3 minutes to harden slightly
Place 1/4 teaspoon of peanut butter on top of the bottom layer. For a neater result for the peanut butter a little so that the edges are not touching to allow room for melted chocolate to cover it
Take 1-1.5 teaspoon of melted chocolate to cover over peanut butter. A simple shake will allow it to spread more evenly rather than adding more chocolate. Unless that's what you'd like to do
Allow to harden at room temperature or place in the refrigerator if you don't want to wait. That's it!