Ellen- I tried protein powder with Irish oats and the result was a cement like mixture
Regular old fashioned oatmeal and pp is fine, but I personally couldn't get through the pp and Irish oats. I love them plain with cinnamon, but the combo just didn't work for me!
I use pp (a blended form) for baking. I called the manufacturer and they told me it wouldn't change the nutritional value.
Mel