Chocolate-Peanut Butter Cookie Pie
["1 (18 oz.) pkg. Pillsbury refrigerated chocolate chip cookies with walnuts", "3 c. powdered sugar", "1 c. peanut butter", "2 Tbsp. margarine, softened", "1/4 c. water", "1 c. milk chocolate chips, melted", "16 pecan halves"]
["Heat oven to 350\u00b0. Remove cookie dough from wrapper. With floured fingers, press dough in bottom of ungreased spring-form pan. Bake for 14 to 18", "minutes until golden brown. Cool 15 minutes."]
["chocolate chip", "powdered sugar", "peanut butter", "margarine", "water", "milk chocolate chips", "pecan"]