Line a 9x9-inch baking dish with parchment paper, leaving some overhang on the sides for easy removal later.
In a large mixing bowl, combine the pretzel sticks and melted butter. Stir until the pretzels are fully coated.
Transfer the pretzel mixture to the prepared baking dish. Using the back of a spatula, press it down firmly to create an even layer.
In another bowl, mix together the creamy peanut butter and powdered sugar until well combined and smooth.
Evenly spread the peanut butter mixture over the pretzel base, smoothing it out with a spatula.
In a microwave-safe bowl or using a double boiler, melt half of the chopped semisweet chocolate, stirring until smooth.
Pour the melted chocolate over the peanut butter layer, using the spatula to spread it evenly.
Melt the remaining chopped chocolate and drizzle it over the top of the bars for an extra touch of chocolatey goodness.
Refrigerate the bars for at least 2 hours or until set.
Once set, lift the bars out of the baking dish using the parchment overhang. Cut into squares and enjoy your delicious No-Bake Chubby Hubby Bars!