Preheat oven to 350ºF. In a mixing bowl, beat the butter and the sugars together until creamy. Add the vanilla and egg and mix well. Add the flour, baking soda, cinnamon and salt, and stir just until combined. Finally, stir in the oatmeal, raisins, and sunflower seeds.
Drop by tablespoon-ful onto an ungreased baking sheet. Bake in a 350ºF oven for 12-14 minutes, or until golden brown. Remove to a baking rack to cool completely.