[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).

[kstenerud]

Quark is also simple to make. 1 part buttermilk to 4 parts milk (3% or better), ferment it at 40 degrees C for 20 hours, then strain it overnight.