Method:

• Heat oven to 350°F (180°C). Spray bottom and sides of 9x13-inch (23x33 cm) rectangular baking pan with non-stick cooking spray.
• In large bowl, combine cookie base ingredients until soft dough forms. Press dough in bottom of pan. Set aside.
• In large bowl, beat cream cheese, granulated sugar, 1/4 cup (50 mL) butter, the flour, 1 tsp (5 mL) vanilla and the egg with electric mixer on medium speed until smooth. Stir in 1/4 cup (50 mL) pecans. Spread over cookie dough base. Sprinkle with chocolate chips.
• Bake 26 to 28 minutes or until filling is set. Sprinkle evenly with marshmallows. Bake 2 minutes longer.
• In 2-qt (2 L) saucepan, melt 1/2 cup (125 mL) butter over medium heat. Stir in cocoa and milk. Heat to boiling, stirring constantly. Remove from heat. With wire whisk, gradually stir in icing sugar until well blended. Stir in 1 tsp (5 mL) vanilla and 1 cup (250 mL) pecans. Immediately pour over marshmallows, spreading gently to cover. Cool 30 minutes.
• Refrigerate about 2 hours or until chilled. For bars, cut into 6 rows by 4 rows. Store covered in refrigerator.