Line your square pan with parchment paper to prevent sticking and make removal easy.
In a microwave-safe bowl, combine the peanut butter and honey. Microwave in 30-second bursts, stirring well each time, until the mixture is smooth and fragrant—about 1-2 minutes total.
Add the crushed graham cracker crumbs to the melted mixture. Stir thoroughly until everything is evenly coated and the mixture is sticky.
Pour the peanut butter mixture into your prepared pan. Use a spatula or the back of a spoon to press it down firmly and evenly, creating a compact layer.
In the same bowl, melt the chocolate chips with the tablespoon of butter. Microwave in 20-second bursts, stirring each time until the mixture is glossy and smooth—about 1 minute total.
Spread the melted chocolate evenly over the pressed peanut butter layer using a spatula. Gently tap the pan to settle the chocolate and help it spread smoothly.
Let the bars sit at room temperature for about 10 minutes, or place in the fridge for 5 minutes, until the chocolate is set and glossy.
Once firm, lift the whole block out of the pan using the parchment paper and place on a cutting board.
Use a sharp knife to cut into 12 even squares. Wipe the knife with a warm cloth between cuts for clean edges.
Arrange the bars on a plate or store them in an airtight container in the fridge. Serve straight from the fridge for a chewy, chocolatey treat.
