Crush Oreo cookies into very fine crumbs using a food processor or rolling pin.
Mix the crushed Oreos with melted butter until the mixture resembles wet sand.
Press the Oreo mixture firmly into the bottom of a lined baking dish to form the base layer.
In a bowl, mix peanut butter, powdered sugar, and vanilla extract until smooth.
Spread the peanut butter mixture evenly over the Oreo base.
Melt chocolate chips with 2 tablespoons peanut butter until smooth and glossy.
Pour the melted chocolate mixture over the peanut butter layer.
Spread evenly with a spatula.
Sprinkle crushed Oreos on top.
Refrigerate the bars for at least 1 hour until fully set.
Slice into squares and serve.
