In a spacious mixing bowl, add the creamy peanut butter, honey (or maple syrup), vanilla extract, and salt. Use a spatula or whisk to blend the ingredients until the mixture is smooth and well combined, ensuring no lumps remain.
Slowly incorporate the rolled oats and powdered sugar into the peanut butter mix. Stir continuously until a thick, cohesive dough forms. This should take a couple of minutes.
Prepare an 8x8 inch (or similar-sized) baking pan by lining it with parchment paper. Make sure to leave some paper hanging over the edges to facilitate easy lifting later.
With clean hands or using a spatula, evenly press the peanut butter mixture into the bottom of the lined baking pan. Smooth the surface until it's level.
In a microwave-safe bowl, place the dark chocolate chips. Microwave in 30-second intervals, stirring well between each, until the chocolate is fully melted and silky. Be cautious not to overheat.
Carefully pour the melted chocolate over the pressed peanut butter layer. Use a spatula to gently spread the chocolate evenly across the top for a smooth finish.
Place the baking pan in the refrigerator and chill for at least 1-2 hours or until the bars are firmly set. Once set, use the parchment paper overhang to lift the entire block out of the pan. Cut into squares or rectangles as desired.
Notes
For an enticing presentation, arrange the bars on a decorative serving platter. Garnish with a sprinkle of crushed peanuts and drizzle extra melted chocolate over the top.