Filling

1. Step 1

   Combine dried plums, walnuts and ¼ cup sugar in a food processor; pulse until coarsely chopped (or chop plums and nuts and combine with sugar). Set this mixture aside.

Cookie Base

1. Step 1

   Preheat oven to 350°F.

2. Step 2

   In a mixing bowl, cream butter and sugars until light and fluffy. Add eggs and vanilla; mix thoroughly. Combine flour, salt and baking soda; add to butter/egg mixture and mix until well blended. Stir in oats.

3. Step 3

   Spread half of the mixture evenly into a 9x13-inch baking pan. Sprinkle the top evenly with dried plum/nut mixture; and press into cookie base. Spread the remaining cookie base evenly over the filling, (Do not worry if the filling shows through slightly.)

4. Step 4

   Bake 25 minutes or until lightly brown. Cut while still warm into 48 pieces.