Preheat oven to 375ºF. Using an electric mixer, beat butter or margarine and sugar together in a medium mixing bowl until light and fluffy. Add eggs; mix well. Combine oats, flour, baking soda and salt in a separate mixing bowl. Add to butter mixture in several additions, mixing well after each addition. Stir in dried cranberries. Drop by rounded teaspoonfuls onto ungreased cookie sheets. Bake for 10 minutes or until golden brown. Makes 2 dozen cookies.