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["Preheat oven to 375*F.", "Line at least 3 cookie sheets with parchment paper.", "COOKIES: Cream together the butter and brown sugar until well blended; add vanilla.", "Combine the oats, flour, baking soda, and salt.", "Add alternately to the butter mixture with water stirring with a spoon.", "Mix well after each addition.", "(Mixture will be crumbly, but will hold together when shaped into a ball.) Add additional water, if necessary.", "Reserve 1 cup of the mixture for the topping.", "Shape remaining dough into 1"" balls; place 2"" apart on the cookie sheets.", "Flatten each cookie to an 1/8"" thickness with the bottom of a floured glass; smooth edges.", "Bake for 5-7 minutes, or until light brown around the edges and firm to the touch; do not overbake.", "Remove from oven; cool on cookie sheets about 5 minutes.", "For the TOPPING, place 1 teaspoons.", "fie filling in the center of each cookie; spread carefully to cover.", "Combine the 1 cup reserved crumbs and nuts in a small bowl; toss to blend.", "Sprinkle over filling.", "Return to oven and bake 5 minutes more, or until topping is light brown.", "Do not overbake.", "Cool 2 minutes on cookie sheets, then transfer cookies to wire racks and cool completely.", "If desired, sprinkle cookies with powdered sugar or cinnamon-sugar."]