Prep: Line a baking sheet or large plate with parchment paper.
Crush the pretzels: In a small food processor, pulse the pretzel sticks a few times to break them into smaller pieces (but not completely into dust). If you don’t have a food processor, snap them by hand or roughly chop them with a knife.
Prepare the dough: In a large bowl, stir the peanut butter, almond flour, maple syrup, and coconut flour until smooth and combined. Add the pretzel sticks and stir well. The mixture will be slightly sticky, with a dough-like feel.
Roll: Roll the dough into 12 balls approximately 1¼ inches in diameter. Place them on the prepared baking sheet or plate.
Chill (round 1): Transfer the baking sheet or plate to the freezer for 10 minutes.
Melt the chocolate: In a small bowl, melt the chocolate chips in the microwave on high in 30-second intervals, stirring after each interval. Alternatively, melt them in a small pot on the stove over low heat, stirring frequently.
Dip: Remove the balls from the freezer, dunk them into the melted chocolate, and return to the baking sheet or plate. The bottom half will be coated in chocolate, with a round section of the peanut-butter-and-pretzel filling exposed at the top. Stop here for classic buckeyes, or use a spoon to scoop chocolate over the top of each ball, smoothing the edges to completely blanket it in chocolate.
Chill (round 2): Return the baking sheet or plate to the freezer for another 10 to 20 minutes, until firm. Serve slightly chilled or at room temperature.