We do not make them like that, and use 1 egg per pound of mix with no celery, cracklins or mushrooms. We may serve them in a mushroom sauce. There are 100s of recipes for meat balls, its whichever one you and your guest like. Our meatloaf is a different mixture, as is French roast and Salisbury steaks.
Saute the chicken first for better flavor then take it out put the veges . in same pot so chicken fat helps cook them . Add herbs and spice at this point especially if they are dry. By doing this way all flavors and spices will combine. Why blackened chicken?? Recipe is to busy.