Line a rimmed cookie sheet with parchment or waxed paper.
Melt the chocolate in a double boiler over simmering water until smooth.
(You can also melt in the microwave in a 2 quart glass dish. Microwave on high for 1 minute and stir. Microwave on high for 1 minute more and stir. If necessary, microwave on high for 10 seconds more and stir until the chocolate is melted and smooth.).
Stir in the pretzel pieces and peanuts. (Stir well with a flexible spatula.).
Spoon onto the prepared cookie sheet, spreading the mixture out so that ingredients are relatively evenly distributed.
Allow for the chocolate to cool for several hours or refrigerate for about 45 minutes, until firm.
Break the bark into irregular pieces, like peanut brittle.