Line miniature muffin cups with paper liners.

Place the peanut butter, butter, and salt in a microwaveable bowl. Heat in the microwave until quite soft (for about 30-60 seconds, but check and stir every 20 seconds).

Stir in the confectioners sugar. (Only if you want it sweeter)

Melt the chocolates and shortening in a heatproof bowl, placed over a saucepan of simmering water.

Spoon, or pipe, about one teaspoon of the melted chocolate into each of the paper cups.

Tap the pan gently on the counter to smooth out the chocolate.

Spoon (or pipe) a teaspoon of the peanut butter mixture on top of the chocolate.

Then top with another teaspoon of melted chocolate. Tap the pan gently on the counter to smooth out the peanut butter cups.

If necessary, add a little more chocolate to get a smooth top. Refrigerate about 20 minutes or until set. Store in an airtight container in the refrigerator or they can be frozen.

Note: Mine actually set at room temp. And if you are not so particular about how they look, you can just do it in layers. It won't look like reese's but it tastes pretty awesome.