This one is pretty popular right now I like to switch out the jelly for nutella or chocolate or skip it altogether and have plain peanut butter bars.
2 sticks unsalted butter at room temperature, cut into squares
1 1/2 cups sugar
1 teaspoon vanilla
2 large eggs
2 cups smooth peanut butter
3 cups flour
1 teaspoon baking powder
1 1/2 teaspoons kosher salt
1 1/2 cups (18 oz.) raspberry or favorite flavor of jam
2/3 cup salted peanuts, coarsely chopped
Grease a 9 x 13 baking pan; then dust the pan with flour.
In a large electric mixer bowl, cream butter and sugar on medium-high speed until light yellow, approximately 2 minutes.
Turn mixer on low; add vanilla, eggs, and peanut butter, and mix until all of the ingredients are combined.
In a medium bowl sift together the flour, baking powder, and salt.
With the mixer on low, slowly add the flour mixture to the peanut butter mixture. Mix just until combined.
Spread 2/3 of the dough into the baking pan.
Spread the jam evenly over the dough.
Drop small mounds of the remaining dough evenly over the jam. Note: the jam doesn’t have to be completely covered, because it will even out during baking.
Sprinkle the top with chopped peanuts and bake for 40 to 45 minutes until golden brown.