Cream peanut butter, butter and brown sugar in mixer bowl until fluffy.
Add eggs and vanilla; beat well. Blend in flour, stir in 3/4 cup chopped peanuts. Spread evenly in greased 9x9" square pan. Sprinkle with remaining peanuts. Bake at 350 degrees for 25 to 30 minutes, or until lightly brown.
Remove from oven; immediately press chocolate kisses in top...allowing space for cutting into bars. Cool completely. Remove from pan. Wis/Gramma.