Preheat oven to 350º. Sift together flour, salt and baking soda and set aside. Mix together softened butter, sugar and brown sugar until fluffy. Beat in eggs one at a time, then add vanilla. Slowly mix flour mixture into butter mixture until well combined. Then fold in chopped Heath candy bars. Cookie dough should be chilled for at least 30 minutes, up to overnight. Scoop 2 tablespoons of cookie dough, gently form into a ball and place on a parchment covered cookie sheet. Dough balls should be placed about 3 inches apart. Bake for 10-12 minutes, checking after about 8 minutes for browned edges. Once the edges are beginning to brown remove from oven and allow to rest for 2-3 minutes on cookie sheet. Then allow to cool on a cookie sheet.