In a large mixing bowl, combine the graham cracker crumbs, rolled oats, peanut butter, honey (or maple syrup), powdered sugar, and a pinch of salt. Mix until all ingredients are thoroughly combined and the mixture is sticky.
Line an 8x8 inch square pan with parchment paper, allowing some overhang for easy removal later. Spread the mixture evenly in the pan, pressing it down firmly to create a compact layer.
In a microwave-safe bowl, combine the dark chocolate chips and coconut oil. Heat in 30-second intervals, stirring in between, until completely melted and smooth.
Pour the melted chocolate over the pressed peanut butter layer, spreading it evenly with a spatula.
Place the bars in the refrigerator and let them chill for at least 2 hours, or until completely set.
Once set, remove the bars from the pan using the parchment paper overhang and cut into squares.
Notes
Serve on a colorful platter with a sprinkle of sea salt on top for garnish, or drizzle additional melted chocolate over the squares for an extra touch. Enjoy!