Line the Pan: Start by lining an 8×8-inch square baking dish with foil or parchment paper. This makes cleanup easier and helps you lift the bars out later.

Melt the Base Ingredients: In a medium saucepan over medium heat, melt the butter. Add the peanut butter, corn syrup, brown sugar, and a pinch of salt. Stir continuously until everything is fully melted and the mixture is smooth.

Add Crunchy Ingredients: Remove the saucepan from heat. Stir in the crushed corn flakes, ¼ cup of chopped salted peanuts, and vanilla extract until well combined.

Transfer to Pan: Pour the mixture into the prepared baking dish. Use a spatula to press it down evenly and smooth the surface into a compact layer.

Melt and Spread Chocolate: Melt the chopped chocolate in a heatproof bowl over a pan of simmering water or microwave in short bursts, stirring in between. Once melted, pour over the pressed mixture and spread evenly with a spatula.

Top It Off: Sprinkle the remaining ⅛ cup of chopped peanuts over the chocolate layer for an extra crunch and visual appeal.

Chill Until Set: Refrigerate the pan for at least 2 hours, or until the bars are firm and set.

Slice and Serve: To cut into clean squares, run a knife under hot water, wipe it dry, and slice through the bars in one smooth motion. Repeat as needed for even cuts.