1. Preheat your oven to 350 F and line a 9 x 13 baking dish with parchment paper. Spray parchment paper with cooking spray.
2. With an electric mixer and paddle attachment, beat the butter, peanut butter, and sugars until combined.
3. Add the egg, vanilla, milk, salt, and baking soda and mix until combined.
4. Slowly mix flour on low until all flour is mixed in.
5. Press half the dough onto the bottom of the baking dish. Bake for 10 minutes.
6. After the 10 minutes, take the cookie bars out.
7. Carefully drop spoonfuls of jam on top of the dough. Take the remaining dough and press it in the palms of your hands to make large flattened pieces. Cover the layer of jam.
8. Bake for an additional 15 mintues or until the top starts to turn golden.

Peanut Butter Frosting

1. With an electric mixer and paddle attachment, beat the softened butter and peanut butter until combined.
2. Add the sugar and mix until just combined.
3. Add the milk and beat on high until light and fluffy.
4. Once the bars have cooled, pipe peanut butter frosting on each piece and top with berries tossed in sugar.