In a mixing bowl add butter and both sugars and beat until creamy. Add milk and egg and continue mixing until smooth.
In a separate bowl add the remaining dry ingredients and stir with a whisk to blend ingredients well. Stir dry ingredients into the mixing bowl with butter/sugar mixture and stir until well blended. Fold in raisins and walnuts.
Line cookie sheet with parchment paper and drop dough by rounded tablespoonfuls about 2 inches apart.
Bake at 350° for about 8-10 minutes or until the cookies are light brown and crispy around the edges.
Remove from oven and allow to cool on cookie sheet for 2 minutes then move to wire cooling rack.