Cheesy Chicken Spaghetti

INGREDIENTS

1 lb

thin spaghetti

medium onion (finely diced)

celery rib (finely diced)

8 oz

sliced baby bella mushrooms [or your preference]

olive oil

4 cloves

garlic (minced)

1/2 cup

[1 stick] butter or light butter

seasoned salt and black pepper

1/3 cup

AP flour

4 cups

whole milk

2 tsp

dry Italian seasoning

1 tsp

seasoned salt

1/4 tsp

black pepper

1/3 cup

grated Parmesan cheese plus 2 Tbsp

4 oz

jar pimentos (well drained)

3 cups

cooked chicken (roughly chopped)

3 cups

shredded white sharp cheddar cheese or Italian cheese blend (divided)