Step 1: Prepare the Peanut Butter Layer

1. In a large bowl, combine the melted butter, graham cracker crumbs, powdered sugar, and creamy peanut butter.
2. Mix until well blended. The mixture should be thick and crumbly.
3. Press the mixture evenly into a 9×13 inch baking dish. Use the back of a spoon or a spatula to smooth it out.

Step 2: Prepare the Chocolate Layer

1. In a microwave-safe bowl, combine the chocolate chips and ¼ cup of creamy peanut butter.
2. Microwave in 30-second intervals, stirring after each, until the chocolate and peanut butter are fully melted and smooth.
3. Pour the chocolate mixture over the peanut butter layer and spread evenly.

Step 3: Chill and Serve

1. Refrigerate the bars for at least 2 hours, or until the chocolate is firm.
2. Once set, cut into squares and serve. Enjoy the delicious combination of creamy peanut butter and rich chocolate!