Sift together flour, salt, baking powder and soda. In bowl cream together butter and sugar until light and fluffy. Beat in eggs individually. Add vanilla. Gradually add dry ingredients to creamed mixture, mixing well after each addition. Shape dough into 1 1/2to 2-inch rolls. Wrap rolls in foil. Chill at least 3 hours or overnight in refrigerator. Cut into slices 1/8 to 1/4 inch thick. Bake on ungreased baking sheets at 375 degrees 10 to 12 minutes. Each cookie contains about: 77 calories; 83 mg sodium; 19 mgcholesterol; 4 grams fat; 9 grams protein; 0.02 gram fiber. Presented by: Rose Dosti, L.A. Times Culinary SOS column, 1/19/95, H21. ----