In large bowl, combine all base ingredients except flour; blend well. Stir in flour; mix well. If necessary, refrigerate dough for easier handling.
Heat oven to 325. On well floured surface, roll half of dough to 12x8 inch rectangle. Using pastry wheel or knife,cut into 2 inch squares. Place 1/2 inch apart on ungreased cookie sheets. Bake at 325 for 12 to 16 minutes or until set. Cool on wire racks. Repeat with remaining dough.
In medium saucepan, combine caramels, 1/4 cup whipping cream and 1/4 cup margarine; cook over low heat, stirring frequently, until caramels are melted and mixture is smooth. Remove from heat; stir in 1 cup powdered sugar and chopped pecans. (Add additional whipping cream a few drops at a time, if needed for desired spreading consistency.) Spread 1 tsp of warm filling on each cookie square.
In small saucepan, combine chocolate chips,2 tbsp whipping cream and 1 tbsp margarine; cook over low heat, stirring frequently,until chocolate chips are melted and mixture is smooth. Remove from heat; stir in 1/4 cup powdered sugar and 1 tsp vanilla. Spread glaze over caramel filling. Top each cookie with pecan half.