-------------------------------FOR DECORATION------------------------------Pecan halves Beat butter and sugars together until creamy. Blend in egg and melted chocolate. Sift together flour, soda and salt. Add to creamed mixture alternately with sour cream and milk. Stir in oats. Drop by teaspoonfuls onto lightly greased cooky sheets. Bake in preheated moderate oven (375 F.) 10 to 12 minutes; cool. For frosting, combine all ingredients. Beat until smooth and of spreading consistency. Frost cooled cookies. Top each cooky with a pecan half.