Preheat oven to 350.

Spray with non-stick spray an 8x8 or 9x9 pan, set aside.

Using mixer, cream butter, peanut butter, and brown sugar.

Add egg and vanilla, and mix well.

Add flour and mix until combined.

Press mixture into pan.

Drop peanut butter and jelly in spoonfuls on top of dough.

Use a knife to swirl the two together into the dough.

Bake for 20-25 minutes.

Let cool completely.

Melt peanut butter in microwave for 15-25 seconds.

Drizzle warmed peanut butter on top of bars. (I used a pastry bag, cut out a small hole and drizzled back and forth across bars.

Cut into bars and serve.