In a large skillet over high heat, melt the butter.
2 tbsp butter
Add in the carrot, onion, and celery and cook, stirring often, until softened (roughly 2-3 minutes) then transfer them to a large mixing bowl.
1 carrot, 1 small white onion, 1 stalk celery
To the same bowl add the meatballs, stock, oil, parsley, rosemary, sage, bread, salt & pepper. Stir everything together until evenly combined.
18-20 frozen meatballs, 2 cups chicken stock, 1/3 cup extra virgin olive oil, 1/2 tsp dried parsley, scant 1/2 tsp dried rosemary, scant 1/2 tsp dried sage, 1 16 oz loaf ciabatta bread (or ciabatta rolls),, salt & pepper
Spread the stuffing mixture out evenly into a large cast iron skillet (or into a 9" x 13" baking dish) and spread it out in an even layer.
Bake at 450 degrees or until golden brown and bread is slightly crisp on top, roughly 15-20 minutes.
Sprinkle with chopped fresh parsley, then serve and enjoy!
1 tbsp chopped fresh parsley