In a large mixing bowl, combine rolled oats, creamy peanut butter, honey or maple syrup, cocoa powder, and a pinch of salt. Stir vigorously until all ingredients are thoroughly blended, and a cohesive mixture forms, approximately 2–3 minutes.

Line an 8x8-inch baking dish with parchment paper. Transfer the oat mixture into the lined dish and press it down evenly, creating a compact layer.

In a microwave-safe bowl, add dark chocolate chips and heat in 30-second intervals, stirring in between, until melted and smooth.

Place the baking dish in the refrigerator for at least 1 hour to allow the chocolate to harden and the bars to set properly.

Once set, remove the baking dish from the fridge and lift out the bars using the parchment overhang for easy handling. Slice the bars into desired sizes.