Heat oven to 350° F.
Beat butter, brown sugar, granulated sugar, milk, egg and vanilla until light and fluffy.
Combine flour, cinnamon, baking soda and salt.
Add to butter mixture and mix well.
Stir in oats and raisins. Drop by tablespoonfuls onto greased cookie sheets.
Bake 12 to 15 minutes. Remove from cookie sheets.
Cool on wire racks.