In a large mixing bowl, combine 2 cups of rolled oats with ½ cup of unsweetened cocoa powder.

In a separate bowl, stir together 1 cup of natural peanut butter and ⅓ cup of honey or maple syrup.

Gradually pour the dry ingredient mixture into the wet mixture, folding gently until fully incorporated.

Line an 8x8 inch baking dish with parchment paper, transfer the mixture, and press it down evenly.

Melt 1 cup of dark chocolate chips in a microwave-safe bowl and pour over the pressed mixture.

Cover with plastic wrap and refrigerate for 1-2 hours, or until bars are firm.

Once chilled, lift the bars out using the parchment overhang and slice into squares.