Preheat the oven to 375 degrees. Spray a 9 x 9 baking dish with cooking spray and set aside.
In a medium mixing bowl combine the flour, baking powder, and salt. Set aside.
In a large bowl cream together the butter, sugar, and brown sugar.
Mix in the peanut butter, vanilla, and eggs and stir well to combine.
Stir the dry ingredients into the wet ingredients and mix until just combined.
Fold in the chocolate chips.
Spread the batter into the prepared pan. Arrange the peanut
butter cups over top of the batter, pushing them slightly into the
batter.
Bake for 20-25 minutes or until a toothpick comes out with just a few crumbs. Cool on a wire rack.