In a medium bowl, combine oats, flour, baking powder, salt and cinnamon; set aside. Using an electric mixer, cream butter and both sugars until incorporated. Add egg and vanilla; mix thoroughly. Add oat mixture and mix until just combined; fold in raisins.
Drop rounded teaspoons of batter onto 2 ungreased cookie sheets, about 1-inch apart each. Bake for 9 to 10 minutes for chewy cookies or 11 to 12 minutes for crispy cookies. Remove from oven and let cookies rest on cookie sheets for about 2 minutes; remove cookies to a wire rack to cool completely. Yields 1 cookie per serving.
Notes Change the flavor of this recipe by adding walnuts instead of raisins (could affect POINTS values).