Crush the graham crackers into fine crumbs using a rolling pin or food processor, then transfer them to a large mixing bowl.
Melt the butter gently in a microwave-safe bowl for about 30-40 seconds until warm and fragrant.
Add the peanut butter to the melted butter and stir until smooth and glossy, about 1 minute. The mixture should feel gooey and fragrant of roasted nuts.
Pour the peanut butter mixture into the crushed graham crackers along with the powdered sugar. Mix thoroughly until all ingredients are evenly coated and the mixture feels firm but pliable, about 2 minutes.
Press the mixture firmly into the prepared pan, creating an even layer. Use the spatula to pack it down until it feels compact and you hear a slight crackle as you press.
In a microwave-safe bowl, melt the chocolate chips with a teaspoon of coconut oil for about 30-40 seconds, stirring until smooth and shiny. The chocolate should shimmer and smell rich and sweet.
Pour the melted chocolate evenly over the layered peanut butter mixture in the pan. Use the spatula to spread it smoothly to the edges, creating a glossy top.
Tap the pan gently on the counter to settle the chocolate layer and remove air bubbles. Place the pan in the fridge and chill for at least 2 hours, or until the chocolate is set and the bars feel firm.
Once chilled, remove the pan from the fridge. Use a sharp knife to cut into neat squares, wiping the knife clean between cuts for clean edges. The bars should be glossy, firm, and slightly crackly on top.
Serve the bars directly from the fridge for best texture. Store any leftovers in an airtight container in the fridge for up to 3 days or freeze for longer storage. Enjoy this nostalgic, no-bake treat!
