Heat honey (or corn syrup) and brown sugar in a medium saucepan over medium heat, stirring constantly until the sugar dissolves and the mixture starts to bubble.
Remove the pan from heat and stir in peanut butter and vanilla extract until smooth and creamy.
Pour Rice Krispies into the mixture and stir until the cereal is evenly coated.
Grease or line a mini muffin tin. Spoon the mixture into each cup, pressing down gently to pack it in about three-quarters full.
In a microwave-safe bowl, combine chocolate chips and peanut butter. Microwave in 30-second intervals, stirring each time, until smooth.
Spoon the melted chocolate over the Rice Krispie cups and smooth out the tops. Optionally, add mini chocolate chips or flaky sea salt. Refrigerate for at least 30 minutes until the chocolate sets.