Preheat oven to 375 F. Line 12 medium muffin cups with paper liners or spray bottoms with cooking spray. In a food processor, combine ground flax seeds, flours, sugar, baking powder, and salt. Pulse a few times to mix. Transfer mixture to a large mixing bowl. In food processor, pulse apple chunks until finely chopped. Add soy milk and oil and process a few seconds to combine. Add wet ingredients to dry and stir by hand, quickly and lightly, until just mixed. Divide batter evenly between twelve prepared muffin cups. If desired, top each muffin with a walnut half and sprinkle with brown sugar. Bake for 20 to 25 minutes. By "Karen C. Greenlee" on Mar 13, 1999. Recipe by: Veggie Life, January, 1999