Beat cheeses, margarine and water in bowl until blended. Mix in flour and salt. Stir in oats and sunflower seeds until combined. Shape into 12-inch-long roll; wrap securely. Refrigerate about 4 hours or up to 1 week.
Preheat oven to 400°F. Lightly grease cookie sheets. Cut roll into 1/8- to 1/4-inch slices; flatten each slice slightly. Place on prepared cookie sheets. Bake 8 to 10 minutes or until edges are light golden brown. Remove immediately; cool on wire rack.
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