Prepare the Pan: Line an 8x8 inch square baking pan with parchment paper, leaving some overhang on the sides for easy removal.
Mix Dry Ingredients: In a large bowl, combine the graham cracker crumbs, cocoa powder, and salt. Stir until well mixed.
Melt Wet Ingredients: In a microwave-safe bowl, combine the peanut butter, honey (or maple syrup), and vanilla extract. Microwave for about 20-30 seconds until melted. Stir until smooth.
Combine Mixtures: Pour the melted mixture into the dry ingredients. Stir well to combine until it forms a thick dough-like consistency. Fold in the mini marshmallows and chocolate chips.
Press into Pan: Transfer the mixture to the prepared baking pan. Press it down firmly using a spatula or your hands to compact the mixture evenly across the bottom.
Add Topping: Sprinkle the extra mini marshmallows and crushed graham crackers on top of the pressed mixture, gently pressing them in just slightly.
Chill the Bars: Cover the pan with plastic wrap or foil and place it in the refrigerator for at least 2 hours or until firm.
Cut and Serve: Once chilled and set, lift the bars out of the pan using the parchment overhang. Cut into squares or rectangles and serve.
Notes
Arrange the bars on a serving platter, drizzle with additional melted chocolate if desired, and garnish with whole marshmallows for an extra touch. Enjoy!