1Heat oven to 350°F. In large bowl, mix crushed crackers, cookie mix, melted butter and water. Press half of mixture in bottom of ungreased 9-inch square pan or baking dish.
2Sprinkle chocolate chips evenly over mixture. Top evenly with marshmallows. Cover with remaining cookie mixture, pressing to cover marshmallows as completely as possible.
3Bake 30 to 35 minutes or until edges are deep golden brown. Cool completely on cooling rack, about 1 hour. Cut into 3 rows by 3 rows.