Preheat the oven to 375°F and spray a large casserole or baking dish with cooking spray.
In a large bowl, whisk together the shredded cheese, heavy cream, sour cream, Italian seasoning, salt, crushed red pepper flakes and black pepper.
Fold in the pasta, chicken, broccoli, mushrooms, bacon and sun dried tomatoes until fully coated. Transfer to the prepared baking dish.
Top the casserole with bread crumbs.
Bake uncovered for 25-30 minutes or until top is golden brown and bubbly. Allow to cool for 5 minutes before serving.
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*Shredded cheese can include any combination of white cheddar, low-moisture mozzarella, asiago, parmesan, yellow cheddar or colby or pepper jack. **Cooked chicken can be breasts, thighs or cooked shredded chicken from a store-bought rotisserie chicken.