Brown the meat: Heat olive oil in a skillet, add turkey, and season with garlic powder, Italian seasoning, salt, and pepper. Cook until no longer pink.
Prepare cheese layer: In a bowl, mix cottage cheese, Greek yogurt, and (optional) whey protein until smooth.
Layer in the crockpot:
Add a thin layer of sauce.
Layer ravioli, turkey, cheese mix, mozzarella, and sauce.
Repeat layers until all ingredients are used.
Cook: Cover and cook on LOW for 4 hours or HIGH for 2.5 hours.
Rest and serve: Let it sit for 10 minutes before slicing. Top with basil and a sprinkle of mozzarella if desired.