Try following a normal recipe but replace the eggs with a scoop of protein powder and extra baking powder, it's weird but the extra protein mimics the eggs making a great fluffy texture!

Can you tell me what is egg free Diet mean

Enjoy Life has a great muffin mix line.
CherryStone bakery has a great line too...

Check out this website: http://www.allergyawesomeness.com/recipe-index/
There are a lot of easy and delicious recipes

you can also replace eggs with applesauce or mashed banana for use as a binder in baked goods.