If I ever don’t know what to make, I go to this dish!

2 cups cooked, shredded chicken
8 oz spaghetti, cooked and drained
1 can (10.5 oz) cream of mushroom soup
1 can (10.5 oz) cream of chicken soup
1 cup sour cream
1/2 cup chicken broth
1 cup shredded cheddar cheese
1 small onion, finely chopped
1/4 cup green bell pepper, finely chopped
1 tsp garlic powder
1/2 tsp salt
1/4 tsp black pepper
1 cup shredded mozzarella cheese
1/4 cup grated Parmesan cheese