In a large mixing bowl, combine rolled oats with cocoa powder. Whisk until blended.

In a separate bowl, mix peanut butter and honey until smooth.

Gradually add the peanut butter mixture into the oat and cocoa mixture, and fold until combined.

Line an 8x8 inch dish with parchment paper and press the mixture into an even layer.

In a microwave-safe bowl, melt chocolate chips in 30-second increments until smooth. Pour over the pressed mixture and spread evenly.

Chill in the refrigerator for at least 2 hours until firm.

Once set, slice into squares or rectangles.