Chicken Ham Lasagna

Ingredients

• 1 (4 ounce) can chopped mushrooms, drained
• 1 large onion, chopped
• 1/4 cup margarine
• 1/2 cup flour
• 2 teaspoons seasoning salt
• 1 tablespoon white pepper
• 1 tablespoon black pepper
• 1 teaspoon ground nutmeg
• 1 (14 ounce) can chicken broth
• 2 cups half-and-half cream
• 1 (3 ounce) package grated parmesan cheese
• 1 (16 ounce) package frozen broccoli florets, thawed
• 9 lasagna noodles, cooked, and drained
• 2 cups diced ham
• 1 (12 ounce) package shredded monterey jack cheese, divided
• 2 1/2 cups shredded cooked chicken breasts