Preheat your oven to 325 degrees.
Combine your brownie mix, egg, oil and water according to package directions.
Mix in 2/3 of your Butterfinger Baking Bits
Pour into a greased 8in baking pan.
Melt peanut butter in the microwave for 30 seconds.
Drop peanut butter ontop of the brownies in dollops.
Using a knife swirl peanut butter to create a marbled pattern.
Bake for 25 minutes.
Sprinkle remaining Butterfinger pieces on top of brownies.
Bake for an addition 5-10 minutes until a toothpick comes clean from brownies.
Slice and serve.