Step 1

Cook the noodles al dente, according to package directions.

Step 2

Preheat the oven to 350° and spray a 9x13 inch pan with cooking spray.

Step 3

Melt 3 tablespoons of butter in a large saute pan and cook the onions and garlic for 4 minutes.  Add the salt, pepper, celery and bell pepper and cook for another 2 minutes.

Step 4

Add the mushrooms and saute for an additional 4 minutes.

Step 5

Stir in the chicken, spaghetti sauce, cream of chicken soup, heavy cream, and the cream cheese.  Stir till combined.

Step 6

Pour the sauce over the noodles and toss till combined.  If you want it a little bit saucier, add a little bit of the spaghetti water.

Step 7

Spread the  spaghetti out in the pan and sprinkle with the cheese.

Step 8

Melt the remaining butter and stir into the bread crumbs.

Step 9

Sprinkle the top with the breadcrumbs.

Step 10

Place the pan in the oven and bake for 30 minutes, or until the casserole is bubbly and the topping is nicely browned.

Step 11

Remove and serve with your favorite side dish.