Mix flour, baking soda and salt together. In another bowl, beat softened butter, white sugar, brown sugar on med. speed till light and fluffy. TIP: If your butter is too cold, place in mirco for 24-45 seconds. Add egg and vanilla beat till well blended. Gradually add flour mixture, beating until well blended. Stir in morsels and Heath bits. Drop by heaping tablespoons onto ungreased baking sheet 2 inches apart. Bake 375° for 9-11 minutes or till lightly brown.