1Heat oven to 350°F. Grease bottom only of 13x9-inch pan with shortening or cooking spray.
2In medium bowl, stir cookie ingredients until soft dough forms. Drop dough by tablespoonfuls onto bottom of pan.
3In another medium bowl, stir brownie ingredients until well blended. Drop batter by tablespoonsfuls evenly between mounds of cookie dough.
4Bake 30 to 35 minutes or until cookie portion is golden brown. Cool completely, about 1 hour. For 24 bars, cut into 6 rows by 4 rows.