Lightly grease a 9×13-inch baking pan and line it with parchment paper, leaving an overhang.
In a large pot, combine honey and sugar. Heat the mixture over medium-low heat, stirring frequently, until it begins to gently simmer—look for small bubbles forming around the pot’s edges, but be careful not to let it reach a full boil.Allow these small bubbles to simmer for exactly 1 minute, then quickly remove the pot from heat.
Working quickly, add 1 cup peanut butter, vanilla extract, and salt to the pot, stirring until smooth. Fold in the cereal, gently, until all the cereal is really well coated.
Transfer the mixture to the prepared pan. Using a silicone spatula, spread evenly, and lightly press down to secure in the pan without compacting it too firmly.
In a microwave-safe bowl, combine the chocolate chips and 2 tablespoons of peanut butter. Melt in the microwave in 15-second bursts, stirring between each burst, until smooth. Spread the melted chocolate evenly over the cereal base. Optionally, sprinkle a tiny amount of salt over the chocolate.
Cover the pan and refrigerate until firm, about 1–2 hours. Using the overhanging parchment paper, lift the entire block from the pan and cut into squares.
Notes
Storage: Store leftover squares at room temperature for up to 3 days or refrigerate for up to 1 week.