Blend these ingredients together into a smooth consistency.
Drop equal portions of peanut butter filling in a 3 x 3 array over the top.
Gently cut through the blobs horizontally, then vertically using an offset spatula, knife or a wooden skewer.
Bake at 350°F for about 40-45 minutes until toothpick inserted in center brownie portion , avoiding PB filling, is no longer wet. My brownies took 45 minutes, but ovens vary, so check at 40 minutes to start.
Allow them to cool completely before cutting.