In a small pot, bring milk and coconut milk to a boil over medium heat. Add oats. Reduce heat to medium-low and simmer until milk is absorbed (approximately seven to 10 minutes), stirring occasionally. Remove from heat.
In a separate bowl, combine water with whey protein, mixing with a fork until protein is dissolved. (For a smoother consistency, combine in a blender or food processor.) Pour protein mixture over oatmeal, add banana and serve.
Per serving: 262 calories, 8 g fat (6 g saturated fat), 27 g carbohydrates, 3 g fibre, 7 g sugar, 20 g protein.