In a blender (or smoothie machine) add the ingredients in the order where the ice and oats are next to the blades.. Then add the blueberries, bananas, yogurt, milk, flaxseed, honey and protein powder.
Blend/process on high for 15-30 seconds until smooth and creamy. Add more milk if a thinner consistency is desired.
Store any leftover smoothie covered in the fridge.