"Instant Pot Firefighter's Spaghetti--an all-in-one pot chicken spaghetti casserole with a creamy, cheese sauce...."
INGREDIENTS
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¼ cup butter, divided
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1 cup diced onion
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2 ribs of celery, sliced
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8 oz mushrooms, sliced
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1 tsp garlic powder
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1 tsp kosher salt
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1 tsp black pepper
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1 tsp poultry seasoning
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1 tsp Italian seasoning
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1 ½ cups chicken broth
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8 oz spaghetti
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1 to 1 ½ pounds boneless, skinless chicken breasts or thighs (or you can use cooked rotisserie chicken)
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1 cup sour cream
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1 Tbsp cornstarch
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⅓ cup heavy cream
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1 cup shredded mozzarella
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¼ cup shredded parmesan cheese
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Optional: 1 cup cornflakes, crushed