Chicken Spinach Lasagna

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One 10-ounce package frozen spinach, thawed and drained

2 boneless, skinless chicken breast halves, cooked and shredded 

2 cups grated Cheddar (5 ounces) 

1 small onion, finely chopped 

1 tablespoon cornstarch 

1/2 teaspoon salt 

1/4 teaspoon black pepper 

1 tablespoon soy sauce 

One 10-ounce can cream of mushroom soup 

One 8-ounce container sour cream 

1/2 cup sliced fresh mushrooms 

1/3 cup mayonnaise 

8 ounces no-boil lasagna noodles 

1 cup grated Parmesan

1 cup pecans, finely chopped