In a large microwave-safe bowl, combine chocolate chips and coconut oil. Microwave in 30-second intervals, stirring thoroughly between each burst. This typically takes 60-90 seconds total. The key is patience here – rushing this step can cause the chocolate to seize. Once it is melted and glossy smooth, you are ready to move forward.
While the chocolate remains warm, immediately fold in the mini marshmallows and 2 cups of Golden Grahams cereal. Mix gently but thoroughly with a silicone spatula, ensuring every piece gets coated in that beautiful, melted chocolate. If the mixture appears too wet or sticky, gradually add the remaining ½ cup of cereal until you achieve the perfect balance of binding and texture.
Line your 8×8 pan with parchment paper, leaving it overhanging for easy removal. Lightly spray with cooking spray to prevent sticking. Transfer the chocolate mixture into the prepared pan and use your spatula or clean hands to press it evenly across the surface. Take time to create uniform thickness for consistent bars.
Refrigerate the pressed mixture for at least 30 minutes until firm and set. Once chilled, use the parchment overhang to lift the entire block from the pan. With a sharp knife, cut into 16 even squares. Clean the knife between cuts for the cleanest presentation.