In a large mixing bowl, combine the peanut butter, honey (or maple syrup), and melted coconut oil. If using, add the vanilla extract. Mix well until smooth.
Add the rolled oats, crispy rice cereal, and salt to the mixture. Stir until all dry ingredients are fully coated and evenly mixed.
Line an 8x8-inch baking dish with parchment paper, leaving some overhang for easy removal.
Pour the peanut butter mixture into the prepared dish. Press down firmly and evenly using a spatula or your hands to ensure they are compact.
Melt the dark chocolate chips in a microwave-safe bowl in 30-second intervals, stirring in between, until smooth.
Pour the melted chocolate over the pressed peanut butter layer, spreading it evenly with a spatula.
Place the dish in the refrigerator for at least 1-2 hours or until the bars are firm.
Once set, lift the bars out of the dish using the parchment overhang and cut into squares or rectangles.
Notes
Arrange the bars on a beautiful serving platter and sprinkle with crushed nuts or a drizzle of extra melted chocolate for added flair.