Beat cheeses, margarine and water in large bowl until well blended. Add flour and salt; mix well. Stir in oats and sunflower kernels; mix until well combined. Shape dough into 12-inch-long roll; wrap securely. Refrigerate about 4 hours (dough may be stored up to 1 week in refrigerator).
Preheat oven to 400 degree 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.
Favorite recipe from National sunflower Association