In the bowl of a stand mixer, cream together the butter and sugar until whipped and fluffy.
Add in the eggs, extract, and peanut butter-- mixing until evenly incorporated.
Slowly add in the flour and baking powder, mixing consistently until evenly incorporated.
Lightly grease a 9x13" pan with non-stick cooking spray. Spread 2/3 of the batter evenly out over the bottom of the pan.
Using a spatula, spread the jam/jelly out over the batter leaving a half inch clean on all sides.
Using a teaspoon, drop the remaining batter/dough evenly out over top of the dish.
Bake at 350 degrees for 25-30 minutes, or until the edges are golden brown and cooked through.