Peanut Butter Squares

1 (18.25 ounce) box yellow cake mix (not butter)
1 tablespoon butter, melted
2 eggs
1 cup peanut butter
1 tablespoon butter
1 can Eagle Brand sweetened condensed milk
1 (6 ounce) package chocolate chips
1 box or can coconut pecan cake icing

Mix all of cake mix, butter, eggs and peanut butter. Press 2/3 of mixture into 13 x 9-inch sheet cake pan. Mix all of butter, Eagle Brand milk, chocolate chips and pecan icing mix. Melt together in microwave. Spread over crumb mixture and add remaining 1/3 of crumb mixture to top. Bake at 350 degrees F for 25 minutes. Cool, then cut into squares.