Prepare a Baking Dish: Grease an 8x8-inch baking dish or line it with parchment paper. Set it aside.
Melt Peanut Butter: In a microwave-safe bowl, heat the peanut butter for about 30 seconds until it's soft and easy to mix.
Mix with Cornflakes: In a large mixing bowl, combine the softened peanut butter and cornflakes. Gently stir until the cornflakes are coated with peanut butter.
Press into the Baking Dish: Transfer the cornflake and peanut butter mixture into the prepared baking dish. Use a spatula or your hands to press it down into an even layer. Let it cool and set at room temperature for about 30 minutes.
Cut into Bars: Once the mixture has set, cut it into bars or bite-sized pieces, whichever you prefer. You can use a sharp knife or a cookie cutter for fun shapes.
Melt Chocolate: In a microwave-safe bowl, melt the milk chocolate in 30-second intervals, stirring after each, until it's smooth and fully melted.
Coat Bars: Dip each cornflake and peanut butter bar into the melted chocolate, ensuring it's fully coated. Allow any excess chocolate to drip off.
Place on Parchment Paper: Place the chocolate-coated bars on a parchment paper-lined tray or dish.
Cool and Set: Let the chocolate-coated bars cool and set at room temperature until the chocolate hardens, which typically takes about 30 minutes. You can also speed up this process by placing them in the refrigerator.
Serve and Enjoy: Once the homemade cornflake Butterfingers have set, they are ready to be enjoyed.