Lightly butter a 9 x 13″ pan. In a large bowl, measure rice krispies, flax flakes, cranberries, pumpkin seeds & flax seed. In a large saucepan, slowly melt margarine with marshmallows. Remove from heat, add vanilla. Add mixture from bowl & stir quickly to combine well. Pour into buttered pan & press down firmly. When cool, cut into preferred size pieces.