Melt the semisweet chocolate chips in a heavy pot or a double boiler over low heat, stirring frequently, or melt in the microwave on medium power, stopping the microwave and giving the chips a stir every 15 seconds until they are melted. Remove from the heat and stir in the peanut butter until well combined.
Add the noodles and the pretzels to the chocolate mixture and stir to combine.
Drop the mixture by heaping tablespoons onto the prepared baking sheet. Allow to set (in warmer months, this is best done in the fridge). Let them sit at room temperature for several minutes before serving.
Notes
Double Boiler HackIf you don’t have a double boiler, you can make one by nestling a metal or heatproof glass bowl over a pot with a bit of water in the bottom — bring the water to a boil over medium-high heat, and stir the chips frequently until they melt. You can melt chocolate in a heavy pan, which works just as well, though if you do, make sure you keep the heat very low and stir often.