Here is my favorite breakfast set!

Protein shake with frozen mango and oatmeal.
20g of protein(140kcal) whatever the flavor you like.
100g of frozen mango(64kcal) or whatever you prefer. I think frozen banana is the best and mango second.
30g of oatmeal(114kcal)
100cc of soy milk(50kcal) If you prefer lesser calorie, just add cold water.
100cc of water(0kcal)
total:368kcal
Be sure to use a blender or mixer. 30g of oatmeal seems maximum for 200cc protein shake. More than this, it gets too sticky.
It may seem too much calorie for one glass of protein shake but this is a very filling meal with lot of fiber.
I don't really like oatmeal as it is almost tasteless. But this is very delicious.
Banana is just an option.

Enjoy!