[kstenerud]

With just the oats it's hard. What I do is ferment my own greek yogurt (milk and starter in an instant pot for 9h, then strain it in the fridge overnight) and eat that with müsli mixed in (the German kind that's nothing but whole grains and some raisins, not the garbage that's basically breakfast cereal). Tastes great and gives you a ton of slow-release energy and protein.

[blinded]

Adding greek yogurt thats a good idea!

I've had something similar in Iceland, good call.

[fuzztester]

Greek yogurt has a lot of protein?

[Palmik]

Actual Greek yogurt will have 8-12% of it's weight in protein.

Another option might be curd / quark (differs a lot per country).