Preheat your oven to 350°F (175°C) and line a 9x13-inch baking dish with parchment paper.
In a medium bowl, mix together the melted chocolate chips, butter, sugar, and vanilla extract until well combined.
Add eggs, one at a time, beating until smooth. Stir in flour until just combined, then spread the batter evenly into the prepared baking dish.
Bake for 15-20 minutes, or until the edges are set. Meanwhile, prepare the peanut butter layer.
For the peanut butter layer, mix together peanut butter, powdered sugar, honey, and vanilla in a separate bowl until smooth.
Spread the peanut butter mixture over the baked chocolate layer, then return to oven for another 5-10 minutes until the top is golden and firm to the touch.
Cool completely before cutting into bars and serving.
Notes
These bars are decadent and should be served in small portions. They can be stored in an airtight container for up to a week or frozen for up to a month.