1. In a large skillet, saute the mushrooms, onion & green pepper in butter until tender. Stir in flour until blended. Gradually add milk and broth, bring to boil; cook and stir for 2 minutes or until thickened. Stir in broccoli, parmesan cheese, salt, pepper and nutmeg.
2. Spread 2 cups broccoli mixture in a greased 13 in. x 9 in. baking dish. Top with 4 lasagna noodles, overlapping if needed. Layer 2 cups broccoli mixture, 1-1 1/2 cups ham, 2/3 cups swiss cheese, 4 noodles, 2 cups broccoli mixture, cooked chicken, 2/3 cup swiss cheese, 4 noodles, finishing with remaining broccoli mixture, ham, and swiss cheese.
3. Cover and bake at 350 degrees for 35-45 minutes or until heated through. Let stand for 15 minutes before cutting.