Line an 8x8 or 9x9-inch pan with parchment paper.
In a large bowl, using a hand mixer, mix the peanut butter and butter together.
1½ cups creamy peanut butter, ½ cup unsalted butter
Beat in the graham cracker crumbs, powdered sugar, and salt, mixing until smooth.
2 cups crushed graham crackers, 1 cup powdered sugar, ¼ teaspoon salt
Press the mixture into the baking dish.
Melt the chocolate chips in the microwave in 45 second increments, stirring after each time.
2 cups chocolate chips
Once the chocolate is completely melted, stir in the peanut butter until the mixture is smooth and creamy.
¼ cup creamy peanut butter
Pour the chocolate mixture over the peanut butter layer.
Place in the freezer or refrigerator to allow the chocolate layer to firm up.
Lift the up the parchment paper from the pan and slice into 16 bars.