Preheat oven to 375 degrees. Beat butter, sugar, vanilla extract and salt in a large bowl until creamy. Gradually beat in flour, stir in morsels and pecans. Shape dough into 1-inch balls. Place on ungreased cookie sheets. Bake for 10-12 minutes, or until cookies are set and lightly browned. Remove from oven. Sift powdered sugar over hot cookies on baking sheets for 10 minutes. Remove to wire rack to cool. Sprinkle with additional powdered sugar if desired. Makes 4 1/2 cookies.