12 lbs russet potatoes (peeled and diced) salt and pepper (for seasoning) olive oil (for sauteing) 15 lbs roasted boneless chicken breast - cut into large pieces 3 medium onions - diced 10 cloves garlic - minced 10 cups diced carrots 10 cans white beans, drained and rinsed 2 sticks butter 1/2 cup flour 6 cups chicken stock 2 Tbl poultry seasoning (or to taste) Mozzarella cheese (3 cups) Parmesan cheese (1 cup)
Preheat oven to 350. Place potatoes in saucepan with enough water to cover. Add 1 tbl salt. Cover and cook potatoes until tender. While potatoes are cooking, heat olive oil in skillet and add onion and garlic, cook until soft.
Melt 1 stick butter and flour in saucepan and allow to cook, stirring for 3 minutes. Add onion, garlic, carrots, chicken broth and poultry seasoning. Whisk to combine and cook for 3-5 minutes. Add chicken and beans and stir to combine. Divide between 2 large pans.
Drain the potatoes. Add 1 stick butter, mozzarella cheese and mash. Add enough milk to preferred consistency. Spread on top of chicken and beans mixture. Sprinkle parmesan cheese on top. Put in oven to brown/bake for 15 - 20 minutes.