In a medium bowl, cream together the butter and brown sugar until light and fluffy. Beat in the eggs one at a time. Combine oats, flour, salt and bicarb soda; stir into butter mixture one cup at a time, mixing well after each addition. Stir in dried cranberries and white chocolate. Drop by rounded teaspoons onto ungreased baking trays.
Bake for 10 to 12 minutes in preheated oven, or until golden brown. Cool on wire racks.