Line an 8x8 pan with parchment paper for easy removal.

Stir oats, 1/2 cup peanut butter, honey, and vanilla together until fully combined.

Press the oat mixture firmly into the prepared pan to form an even base.

Melt chocolate chips with 2 tablespoons peanut butter until smooth, then spread over the oat layer.

Refrigerate for 2 hours until firm, then slice into bars.