Mix the flaxseed meal and water and set aside.
Put muffin paper liners in 12 muffin cups.
In a large bowl, combine the flour, both bran cereals, oats, cornmeal, sugar, walnuts, raisins, baking powder, baking soda, cinnamon, ginger and nutmeg.
In a food processor add the flaxseed meal mixture, almond milk, melted butter, and apple and process for about 15 seconds.
Pour this liquid mixture into the large bowl that is holding all the dry ingredients. Stir well until just combined.
Spoon the batter into each muffin cup. The batter will pretty much be to the top of the muffin cups.
Bake at 400° for 25 minutes or until a toothpick, inserted in the center, comes out clean.
Transfer muffins to a rack and let cool.