In a mixing bowl, cream butter, shortening & sugar. Add water & vanilla; mix well. Combine flour, baking soda, baking powder & salt; add to creamed mixture & mix well. Stir in sunflower seeds. Shape into 1-in balls; place 2 in. apart on greased baking sheets. Flatten with a glass dipped in sugar. Bake at 350 degrees for 11-13 minutes or until lightly browned. Remove to a wire rack to cool.
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