For the Crust:

1. Prepare the crust:
   • In a medium bowl, mix together the graham cracker crumbs and sugar. Add the melted butter and stir until everything is evenly combined.
2. Press the crust:
   • Press the crumb mixture into the bottom of an 8×8-inch baking pan (or similar-sized dish) lined with parchment paper or sprayed with cooking spray. Press down firmly to compact the crumbs into an even layer.
3. Chill the crust:
   • Place the crust in the fridge to chill while you prepare the filling.

For the Peanut Butter Filling:

1. Mix the peanut butter filling:
   • In a large bowl, beat together the peanut butter, powdered sugar, softened butter, and vanilla extract until smooth and creamy.
2. Add the cream:
   • Gradually add the heavy cream (or milk) to the peanut butter mixture, continuing to beat until the filling becomes smooth and spreadable.
3. Spread the filling:
   • Once the crust has chilled, spread the peanut butter filling evenly over the graham cracker crust layer. Smooth the top with a spatula.

For the Chocolate Topping:

1. Melt the chocolate:
   • In a microwave-safe bowl, melt the chocolate chips and butter together. Microwave in 30-second intervals, stirring in between, until the chocolate is completely melted and smooth.
2. Spread the chocolate topping:
   • Pour the melted chocolate mixture over the peanut butter layer and spread it evenly with a spatula.
3. Chill the bars:
   • Refrigerate the bars for at least 2-3 hours, or until the chocolate is set and the bars are firm.

To Serve:

1. Cut and serve:
   • Once chilled and set, cut into squares or bars. Serve and enjoy!