In a large pot, cook the spaghetti according to the package instructions.
Drain and set aside.
Combine Ingredients:
In a large mixing bowl, combine the cooked chicken, pimento, chopped green pepper, cream of mushroom soup, chicken broth, salt, pepper, and half of the shredded Cheddar cheese.
Mix well.
Assemble Casserole:
Transfer the mixture into a greased 9 x 13-inch baking dish, spreading it evenly.
Cover with aluminum foil.
Bake:
Bake in the preheated oven for 45 minutes.
Add Cheese:
Remove the foil and sprinkle the remaining shredded Cheddar cheese on top.
Return the dish to the oven and heat until the cheese is melted and bubbly.
Serve:
Serve hot with a green salad and hot French bread for a complete meal.
Notes / Tips / Wine Advice:
Wine Pairing:
A light to medium-bodied white wine like Pinot Grigio or a Chardonnay would complement the creamy and cheesy flavors of the Chicken Tetrazzini, balancing the richness with their crisp acidity.