Step 1

Preheat the oven to 350 degrees F.

Step 2

Grease a 9x13-inch baking dish.

Step 3

Cook the spaghetti to al dente in a saucepan according to the package directions; drain.

Step 4

Return the cooked spaghetti to the saucepan and stir in the chicken, spinach, cream of chicken soup, mayonnaise, sour cream, celery, onion, green pepper, pimientos, and lemon-pepper seasoning.

Step 5

Transfer the pasta mixture to the prepared baking dish.

Step 6

Top the casserole with the Monterey Jack cheese, bread crumbs, and parmesan cheese.

Step 7

Bake, uncovered, until heated through and the cheese is melted, for about 25-30 minutes.

Step 8

Serve.