Preheat oven to 400°F.
Combine first 6 ingredients in a large mixing bowl. Stir well. In a medium bowl, combine brown sugar, oats, flour, baking powder, salt and nuts (optional). Combine with liquid ingredients and mix slightly until dry ingredients are moistened.
Spray muffin cups with non-stick spray and fill 3/4 full. Bake for 20 minutes or until golden brown.
Servings: 12 muffins