In a microwave, melt chocolate, butter and shortening; stir until smooth. Place foil or paper miniature baking cups in a miniature muffin tin. Place 1 tablespoon of chocolate mixture in each cup.
In a microwave, melt peanut butter; stir until smooth. Spoon into cups. Top with remaining chocolate mixture. Remelt chocolate mixture if necessary. Refrigerate 30 minutes or until firm.
