Be sure not to overcook your meatballs in the oven. They will cook through while covered in the pan.
If you do not have a food processor, you can mix this by hand in a large bowl.
Most savory herbs will work in this recipe- I just love thyme, sage and flat leaf parsley because they compliment poultry. Avoid cilantro or coriander or dill. They will overpower the cream sauce.
Try mixing in other veggies like sun dried tomatoes, artichokes or even green olives.